Prosser and Amundsen high schools were playing. The game was tied at one with two minutes remaining when a player on the Prosser team became upset that a foul wasn't called.
Officials say the player punched the referee twice.
The game was stopped and police were called in. The referee didn't press charges. The Illinois High School Association says in addition to the suspension the student is banned from all sports activities.
"This is a deplorable action that has no place in athletics at any level," said the IHSA's Marty Hickman. "Game officials deserve to be treated with the highest levels of respect by coaches, players, administrators and fans. Unfortunately, though, they are subject to far more scrutiny than is warranted. As this happens and perspective is lost, the value of the interscholastic experience is diminished and ruined."
The IHSA ruled the match a forfeit victory for Amundsen, who advances to sectional play.
"CPS is deeply disappointed in the actions of the student in question, which do not reflect the values of the District or those we teach our student-athletes. CPS has taken steps to discipline the student in accordance with the Student Code of Conduct, and he is banned from all sports activities for the rest of the school year due to his inappropriate conduct on the field," said CPS CEO Barbara Byrd-Bennett.