The Illinois High School Association says, students cannot compete in tournaments without school in session.
Currently, the rule impacts those in fall sports.
IHSA says the ban most likely won't affect games at local schools, but it could hurt Chicago football teams.
If they don't play at least eight games, they're disqualified from the playoffs.
"The larger picture is school ought to be operating if you're going to have inner scholastic programs," explained IHSA Executive Director Marty Hickman. "But undoubtedly these kids are going to feel like they're getting the short end of the stick."
Team practices can still be held, but it's up to the Chicago Public Schools board to approve that request.