Carlos Carrasco strained his right hamstring during conditioning drills on Thursday and seems certain to miss the start of the season for the New York Mets.
"He was running sprints and he felt a pull," Luis Rojas said.
A right-hander who turns 34 on Sunday, Carrasco has has not appeared any any exhibition games this year.
Carrasco is in remission from leukemia and got the coronavirus vaccine, causing him to start spring training workouts behind other players. He then stopped throwing for a stretch because of elbow soreness.