Members of the U.S. and Great Britain & Ireland teams at the Walker Cup are dealing with a stomach bug and are under observation at the team hotel, organizers said Friday.

The amateur golf tournament is held every other year and is set to begin Saturday at Seminole Golf Club, with four foursomes matches in the morning and eight singles in the afternoon.

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Cole Hammer of the USA team walks down a fairway as he practices for the Walker Cup golf tournament, starting tomorrow, at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Members of the U.S. and Great Britain & Ireland teams at the Walker Cup are dealing with a stomach bug and are under observation at the team hotel, organizers said Friday.

Members of the USA team watch as Stewart Hagestad tees off during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Both teams have brought two alternates in case players cannot compete.

Workers groom the course after heavy thunderstorms moved through yesterday, on a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

It said GB&I had six players practicing at Seminole, including an alternate, while the U.S. team had five players and an alternate at practice.

Members of the USA team walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Members of the USA team walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

A man and child walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

A man and child walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

The USGA and R&A said in a statement the matches are expected to be held as scheduled.

Cole Hammer of the USA team walks down a fairway as he practices for the Walker Cup golf tournament, starting tomorrow, at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Cole Hammer of the USA team walks down a fairway as he practices for the Walker Cup golf tournament, starting tomorrow, at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Both teams have brought two alternates in case players cannot compete.

Officials said a number of players from both teams have been treated for “gastrointestinal issues." They said COVID-19 has been ruled out as the cause because both teams tested negative in daily screenings and have adhered to the health and safety guidelines required to play.

Golf Channel reported 10 players — five Americans and five from GB&I — along with captains Nathaniel Crosby and Stuart Wilson did not go to the golf course Friday morning.

Members of the USA team watch as Stewart Hagestad tees off during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Members of the USA team watch as Stewart Hagestad tees off during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

It said GB&I had six players practicing at Seminole, including an alternate, while the U.S. team had five players and an alternate at practice.

The Walker Cup features two days of foursomes and singles. The Americans won two years ago at Royal Liverpool. GB&I has not won away from home since 2001.

Workers groom the course after heavy thunderstorms moved through yesterday, on a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Workers groom the course after heavy thunderstorms moved through yesterday, on a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Members of the USA team walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

Members of the USA team walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

A man and child walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)

A man and child walk along the course during a practice day for the Walker Cup golf tournament at Seminole Golf Club in Juno Beach, Fla., Friday, May 7, 2021. (AP PhotoGerald Herbert)