A college in Chicago’s suburbs has postponed two basketball games after an intense workout landed five players in a hospital.

Concordia University Chicago in River Forest also temporarily removed coach Steve Kollar, the Chicago Tribune reported.

Pete Gnan, the athletic director sent a letter to parents, to inform them what happened. He explained the team had been put through a “particularly high-intensity, collegiate-level circuit training” on Dec. 31.

“It has been alleged by some that the intensity and difficulty of Saturday’s practice was a direct consequence” of players breaking curfew while in California, Gnan said.

“Our athletics program has zero tolerance for harassment or retaliatory actions of any kind, and reporting mechanisms are in place for students, coaches, and related staff,” Gnan wrote in his letter.

The Division III Cougars were supposed to play Tuesday and Saturday but those games have been postponed.