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An MRI administered late Monday afternoon revealed the injury. There was no structural damage, a team official said.
The Orioles recalled reliever Chris Britton from Double-A Bowie to replace Cabrera on the roster, and will rely on a four-man rotation into next week.
Cabrera left Sunday's game against Kansas City after taking the mound to start the fifth inning. He gave up two runs, two hits and seven walks before complaining of shoulder stiffness.
"We've got to calm the inflammation down and then start some strengthening exercises for him. It's probably going to be long enough that he's going to miss a couple of starts,'' Orioles manager Sam Perlozzo said.
Cabrera (2-2, 5.23 ERA), has been plagued by wildness. He's walked 39 batters in 41 1/3 innings.
Asked if it's possible that Cabrera was pitching in pain all season, Perlozzo said, "I don't feel like he has, because other than yesterday his velocity has been extremely good. Yesterday, he teetered back and forth.''
Cabrera insisted after Sunday's game that the shoulder had nothing to do with his lack of control against the Royals.
"No, because I walk people all the time. I'm tired of hearing it all the time,'' he said. "Walks, walks. I walk people all the time. That's nothing different to me.''
This is Britton's second stint with the Orioles this season. He was 0-0 with a 5.79 in four appearances, and was 1-0 with an 0.79 ERA in 10 games with the Baysox.
Perlozzo said a fifth starter won't be needed until May 23. He
said Hayden Penn, who's currently at Triple-A Ottawa, will be
strongly considered for the slot.