OAKLAND -- The Orioles continue to rack up injuries, as the team put newly acquired infielder Chris Davis on the disabled list prior to Tuesday's game with a right shoulder strain that could very well end his season.

"I'm not exactly sure how to describe it," president of baseball operations Andy MacPhail said of Davis' shoulder, which an MRI revealed to have a partial tear. "I don't think it's a 911 situation, but it's something we have to watch and make sure it doesn't get worse."

Davis will see noted orthopedic surgeon Lewis Yocum in Los Angeles on Friday, and while MacPhail was hesitant to comment on the length of Davis' DL stint, given the nature of his injury, surgery appears to be a distinct possibility. The Orioles already lost outfielder Luke Scott for the season after he underwent shoulder surgery, and Yocum removed a bone spur on pitcher Jake Arrieta's right elbow -- ending his season -- on Friday.

"I don't know about shutting it down, I don't really want to use that word," Davis said. "But I do know what I need right now is extended rest."

Acquired in a Trade Deadline deal -- along with pitcher Tommy Hunter -- from Texas, Davis said he never got treatment on the area until recently. He thinks the upped playing time for the Orioles -- where he's been the everyday first baseman -- may have aggravated a preexisting injury.

"It is hard to do [rest the injury] having just been traded over here. I want to show what I can do, what I'm capable of doing, but at the same time I don't want to play at 75 percent," said Davis. "I want to go out there and be able to hit and throw."

The 25-year-old Davis hit .241 with four homers and nine RBIs in 38 Major League games split between Texas and Baltimore, and he collected his third multihit game as an Oriole on Saturday against Detroit.

The roster move, which is retroactive to Monday, clears a roster spot for lefty Brian Matusz, who was officially recalled from Triple-A Norfolk to start Tuesday's game in Oakland.

Britton tosses solid rehab start, nearing return

OAKLAND -- Zach Britton, who's currently on the disabled list with left shoulder inflammation, tossed five innings in a rehab start for Triple-A Norfolk Tuesday night.

The left-hander allowed one run on three hits with three strikeouts and a walk in a game against Charlotte.

Britton's only run came in the first inning, and the expectation is he will be ready to come off the DL and make his next start on the Orioles' current road trip.

However, when that will be remains to be seen, as manager Buck Showalter alluded to some other potential physical problems and said that the rotation for the upcoming Angels series in Anaheim is not set yet.

Britton is eligible to be activated as early as Saturday.


• Yocum performed surgery on top pitching prospect Dan Klein on Tuesday morning. The procedure went better than the Orioles were expecting.

Klein had the SLAP tear in his right shoulder fixed with an anchor, and he also had his shoulder capsule loosened. The right-hander will start a throwing program in December, and assuming all goes well, he will be at Spring Training 2012 and could be fully recovered and back in Minor League games as early as May.

• The Orioles designated Luis Lebron for assignment to make room on the 40-man for first-round Draft pick Dylan Bundy, who was signed to a Major League deal late Monday night.

• Top prospect Manny Machado was ejected from Tuesday's game with the Class A Advanced Frederick Keys.