Beckett is 4-7 with a 4.14 ERA in 12 starts this season. In comments to the team's official website, manager Bobby Valentine said Beckett would stay on the roster but may undergo tests over the weekend:
"He may get some tests," Valentine said. "I think they want to do a baseline [exam] to figure out where we are with that whole situation, so there might be tests."
Reliever Franklin Morales will pitch in Beckett's place. Morales is 0-1 this season with a 3.04 ERA over 23.2 innings with opponents batting .236 against the left hander.