An 18-year-old Illinois hockey player died of complications from mononucleosis hours after playing while under the weather, according to a report.

Chicago Fury player Gabe Remy was rushed to the hospital with a ruptured spleen last week after ignoring signs of the fatal illness, ABC News reported.

Though he was suffering from flu-like symptoms, Remy had insisted to his coach that he attend the youth team game, the outlet reported.

“He was excited to play,” coach Al Dorich told the outlet. “We love our guys to be aggressive and to go out there and compete hard, and he never had a problem competing.”

Dorich said spectators wouldn’t have known Remy was sick from his performance in the hockey match.

“If it was your first time watching him you wouldn’t have known the difference,” he said.

But within hours, Remy had to undergo emergency surgery for a ruptured spleen, the outlet reported. He died later that day at the hospital, less than 24 hours after the game.

Experts say it can be dangerous with mono to engage in strenuous workouts since the condition causes the spleen to become enlarged and can put patients at risk for injury, according to the National Institutes of Health.

Someone should not have any physical contact because of the risk of rupturing the organs, something that was experienced by Jets quarterback Sam Darnold at the beginning of this season.

Remy’s teammates said he wasn’t aware that he was suffering from mono and his Nov. 10 death came as a shock to them.

“I kind of, like, expected to come to the rink today and have him here, so. I’m kind of in shock still,” his teammate Zack Zeidel told the ABC News.