May 06, 2007 1:06 AM EST

While winning a wild ballgame, Detroit may have lost a valuable pitcher before he could even get onto the field.

Joel Zumaya, whose fastball can exceed 100 mph, was warming up in the bullpen during Saturday night's 7-5 victory over Kansas City when he "felt something pop" in the middle knuckle of his pitching hand. He was hurried to the hospital.

"He threw a pitch in the bullpen, a fastball, and this joint, this [middle] knuckle, he felt something pop," said manager Jim Leyland. "He's being checked out at the hospital. That's all the information I have for you at this time."

Via ESPN.com