Hamstring spasms forced Jacob deGrom to leave Wednesday night's start against the Philadelphia Phillies.
The New York Mets ace hopes the injury won't mean an early end to his season.
deGrom, 32, said he first felt issues with the hamstring in his previous start, but he didn't tell the Mets.
"I think it's just day by day," he said. "What's weird is running around, playing catch, it seems fine. Then once I get to full intensity in a game is when I feel it. Hopefully it's something we can treat and get back out there as quick as possible."