Cincinnati Reds second baseman Brandon Phillips left Wednesday's game against the San Francisco Giants an inning after getting hit by a pitch on his right hand from Santiago Casilla in the fifth.
Phillips, who was X-rayed afterward, said his hand was too swollen to determine the extent of the damage.
"I don't know right now," Phillips said of his hand. "All I know is it's messed up. I feel like Professor Klump."
Reds' manager Dusty Baker was hoped the injury wasn't serious.
"We don't know about Phillips," he said. "I hope he's OK."
The All-Star was 1 for 3 with a run scored and stolen base before coming out of the contest. He entered play as the NL leader in hits and runs scored.
Phillips was replaced by Chris Valaika.
The injuries have been mounting for the Reds, who already have six players on the disabled list, including infielder Orlando Cabrera. They are also missing pitchers Mike Lincoln, Aaron Harang, Russ Springer and Jose Arredondo, and outfielder Jim Edmonds.
"This is a team and we have to work together," Reds infielder Miguel Cairo said. "When one goes down, someone else has to step up. That's what separates the boys from the big boys. We have to get to the finish."