MIAMI -- The Rays placed ace left-hander Shane McClanahan on the 15-day injured list because of a left shoulder impingement on Wednesday, a day after he was a late scratch from Tampa Bay's 7-2 win over the Miami Marlins.
McClanahan cut his pregame warm-up short Tuesday because of the injury. He later said "something just didn't feel right."
McClanahan underwent imaging on his shoulder Wednesday, which revealed a "best-case scenario," Rays manager Kevin Cash said.
Cash said McClanahan will get an injection in the shoulder when the team returns to Tampa, and he is optimistic that the injury will not lead to an extended absence.
"I think we made the right decision to shut it down and just catch it early," McClanahan said. "When I was told 'best-case scenario,' I was very, very pleased. This could have gone a lot of different ways. For it to be what it is, it's a sigh of relief."
The Rays, who hold the top AL wild-card spot, recalled right-hander Calvin Faucher from Triple-A Durham on Wednesday.
In his second season, McClanahan (11-5) has been one of the top pitchers in the majors. He started the All-Star Game and is second in the AL in wins and ERA at 2.20.
The Rays also placed second baseman Brandon Lowe on the 10-day IL with a right triceps contusion. Lowe hasn't played since being hit by a pitch against the Red Sox on Aug. 26.