Lionel Messi is doubtful for the final of the Spanish Super Cup on Sunday, when his Barcelona will face Athletic Bilbao.

Barcelona’s all-time leading scorer has been nursing an unspecified fitness issue that caused coach Ronald Koeman to leave him out of the semifinal on Wednesday against Real Sociedad. Without Messi, Barcelona needed some great goalkeeping by Marc-Andre ter Stegen to reach — and prevail in — a penalty shootout.

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Barcelona's goalkeeper Marc-Andre ter Stegen celebrates during the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoJose Breton)

Lionel Messi is doubtful for the final of the Spanish Super Cup on Sunday, when his Barcelona will face Athletic Bilbao.

Barcelona's goalkeeper Marc-Andre ter Stegen, left, is greeted by teammate Lionel Messi at the end of the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoFrancisco Seco)

“(Messi) will have the last word, he knows his own body,” Koeman said. “We hope that he can play the game.

Athletic Bilbao players jubilate at the end of the Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. Athletic Bilbao won 2-1 and will play the final. (AP PhotoJose Breton)

That gritty performance gives veteran midfielder Sergio Busquets reason to believe the team is finding its stride after a shaky start to its rebuild under Koeman.

Athletic Bilbao's head coach Marcelino gives instructions from the side line during Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. (AP PhotoJose Breton)

Forward Raul García scored twice to earn the Basque club a 2-1 victory on Thursday.

Barcelona's Lionel Messi center, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Bilbao beat Barcelona in the Spanish Super Cup in 2015, when it was still a two-leg final between the league and Copa del Rey winners.

Barcelona's Lionel Messi, right, scores his team's third goal during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, right, scores his team's third goal during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, left, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, left, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Messi has been training on his own and his readiness is up in the air, Koeman said on Saturday.

Barcelona's goalkeeper Marc-Andre ter Stegen celebrates during the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoJose Breton)

Barcelona's goalkeeper Marc-Andre ter Stegen celebrates during the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoJose Breton)

“(Messi) will have the last word, he knows his own body,” Koeman said. “We hope that he can play the game.

“With Leo, the team is stronger thanks to his ability to create and his effectiveness as a scorer, things that we are sometimes missing. (But) he must be 100%. This is not the last game of the season.”

Barcelona, however, has shown it can win without its star. While not a brilliant attacking performance, Barcelona did have one of its best collective matches in the semifinals to get past an inspired Sociedad.

Barcelona's goalkeeper Marc-Andre ter Stegen, left, is greeted by teammate Lionel Messi at the end of the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoFrancisco Seco)

Barcelona's goalkeeper Marc-Andre ter Stegen, left, is greeted by teammate Lionel Messi at the end of the Spanish Super Cup semi final soccer match between Barcelona and Real Sociedad at Nuevo Arcangel stadium in Cordoba, Spain, Wednesday, Jan. 13, 2021. Barcelona will play the final after defeating Real Sociedad 3-2 in a penalty shootout after the game ended 1-1. (AP PhotoFrancisco Seco)

That gritty performance gives veteran midfielder Sergio Busquets reason to believe the team is finding its stride after a shaky start to its rebuild under Koeman.

“Saying that we have got this all figured out is a bit much, but we are on the right path,” Busquets said. “We are on a good run, feeling better as a group. (Winning the title) would be an important step, and I am convinced this team can continue to grow.”

Bilbao reached the final to be played in Seville after eliminating defending champion Real Madrid.

Athletic Bilbao players jubilate at the end of the Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. Athletic Bilbao won 2-1 and will play the final. (AP PhotoJose Breton)

Athletic Bilbao players jubilate at the end of the Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. Athletic Bilbao won 2-1 and will play the final. (AP PhotoJose Breton)

Forward Raul García scored twice to earn the Basque club a 2-1 victory on Thursday.

The final will be the third match in charge for Bilbao coach Marcelino García Toral. His debut last week was at home against Barcelona in the league. Messi scored twice to help Barcelona recover from an early goal by Iñaki Williams and secure a 3-2 victory.

“We must go into the match thinking that (Messi) will play and that he will play at his best, and that it is our job to stop him,” Marcelino said. “My players are revved up and ready to conquer the world. To beat both Madrid and Barcelona to win this trophy would be the maximum.”

Athletic Bilbao's head coach Marcelino gives instructions from the side line during Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. (AP PhotoJose Breton)

Athletic Bilbao's head coach Marcelino gives instructions from the side line during Spanish Super Cup semi final soccer match between Real Madrid and Athletic Bilbao at La Rosaleda stadium in Malaga, Spain, Thursday, Jan. 14, 2021. (AP PhotoJose Breton)

Bilbao beat Barcelona in the Spanish Super Cup in 2015, when it was still a two-leg final between the league and Copa del Rey winners.

This Spanish Super Cup is in southern Spain after the coronavirus pandemic stopped it from being played in Saudi Arabia for a second straight season. The tournament’s revamped final four format includes the top two finishers in the Spanish league and the finalists of the Copa del Rey from the previous season.

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Barcelona's Lionel Messi center, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi center, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, right, scores his team's third goal during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, right, scores his team's third goal during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, left, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)

Barcelona's Lionel Messi, left, runs with the ball during the Spanish La Liga soccer match between Athletic Bilbao and Barcelona at San Mames stadium in Bilbao, Spain, Wednesday, Jan. 6, 2021.(AP PhotoAlvaro Barrientos)