The La Porte High School student, whose name was not reported, died Wednesday, the La Porte (Ind.) Herald Argus reported.
"Every now and then you hear of a student athlete dying," said La Porte County Coroner John Sullivan. "We really don't know the circumstances yet."
An autopsy will be performed on the teenager Thursday.
The football team has a game scheduled for Friday. It was not reported whether the game would be postponed. A freshman football game scheduled for Wednesday was postponed by the high school to Saturday.