Rays LHP Jake McGee was sent home to be checked by team doctor Koco Eaton after tweaking his left knee during the ninth inning of Tuesday's game.
Manager Kevin Cash said McGee felt something on the second to last pitch of his Tuesday outing, but didn't inform the training staff until after the game.
"We're hopeful that it's not something that's too bad,'' Cash said.
He said they sent McGee back to St. Petersburg in part because he was not going to be available tonight or possibly Thursday anyway after throwing a season-high 33 pitches on Tuesday.
But when asked if McGee would likely join them in Oakland if there was nothing serious found in the MRI and exam Thursday by Eaton, Cash said he wasn't sure, noting the Rays are off Monday, suggesting McGee might need a few days off.
Without McGee, who often works the eighth inning, the Rays are likely to use LHP Xavier Cedeno and RHP Steve Geltz in higher leverage situations. RHP Matt Andriese is also available out of the bullpen after being called up today.