Ahmed Hassan came off the bench to score an injury-time goal for Olympiakos in a 1-0 win over Marseille in the Champions League on Wednesday.

The Egyptian delivered a powerful header to beat goalkeeper Steve Mandanda after Mathieu Valbuena's cross.

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Olympiacos' Youssef El-Arabi, left, runs with the ball in front of Marseille's Pape Gueye, centre and his teammate Alvaro during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Ahmed Hassan came off the bench to score an injury-time goal for Olympiakos in a 1-0 win over Marseille in the Champions League on Wednesday.

Marseille's goalkeeper Steve Mandanda saves the ball next to Olympiacos' Youssef El-Arabi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille, returning to Europe's top club competition after a six-year gap with coach Andre Villas-Boas, had looked happy to settle for a point in the Group C match. The visitors' best chance came from Dario Benedetto moments after the restart. His effort was stopped at close range with some quick reflexes from goalkeeper Jose Sa.

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Alvaro,left, fights for the ball with Olympiacos' Giorgos Masouras during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Alvaro,left, fights for the ball with Olympiacos' Giorgos Masouras during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic runs with the ball during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic runs with the ball during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic, left, is challenged by Marseille's Jordan Amavi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic, left, is challenged by Marseille's Jordan Amavi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Hiroki Sakai, left, challenges for a header with Olympiacos' Jose Holebas during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Hiroki Sakai, left, challenges for a header with Olympiacos' Jose Holebas during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

A steward stands among empty seats during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

A steward stands among empty seats during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Ousseynou Ba, left, trie to stop Marseille's Florian Thauvin during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Ousseynou Ba, left, trie to stop Marseille's Florian Thauvin during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

The Greek champions held the initiative for most of the match at Giorgos Karaiskakis stadium and had a goal disallowed by video review earlier in the second half.

Olympiacos' Youssef El-Arabi, left, runs with the ball in front of Marseille's Pape Gueye, centre and his teammate Alvaro during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Youssef El-Arabi, left, runs with the ball in front of Marseille's Pape Gueye, centre and his teammate Alvaro during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille, returning to Europe's top club competition after a six-year gap with coach Andre Villas-Boas, had looked happy to settle for a point in the Group C match. The visitors' best chance came from Dario Benedetto moments after the restart. His effort was stopped at close range with some quick reflexes from goalkeeper Jose Sa.

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Marseille's goalkeeper Steve Mandanda saves the ball next to Olympiacos' Youssef El-Arabi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's goalkeeper Steve Mandanda saves the ball next to Olympiacos' Youssef El-Arabi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's head coach Andre Villas-Boas gives instructions to his players during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Alvaro,left, fights for the ball with Olympiacos' Giorgos Masouras during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Alvaro,left, fights for the ball with Olympiacos' Giorgos Masouras during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic runs with the ball during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic runs with the ball during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic, left, is challenged by Marseille's Jordan Amavi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Lazar Randelovic, left, is challenged by Marseille's Jordan Amavi during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Hiroki Sakai, left, challenges for a header with Olympiacos' Jose Holebas during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Marseille's Hiroki Sakai, left, challenges for a header with Olympiacos' Jose Holebas during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

A steward stands among empty seats during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

A steward stands among empty seats during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Ousseynou Ba, left, trie to stop Marseille's Florian Thauvin during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)

Olympiacos' Ousseynou Ba, left, trie to stop Marseille's Florian Thauvin during the Champions League group C soccer match between Olympiakos and Marseille at Georgios Karaiskakis stadium in Piraeus port, near Athens, Wednesday, Oct. 21, 2020. (AP PhotoThanassis Stavrakis)