OAKLAND -- Orioles outfielder Felix Pie exited Thursday's game against the Oakland Athletics, clutching his left shoulder after scoring the team's first run in the seventh inning.

Pie, who appeared to injure his shoulder while at the plate, drew a one-out walk and advanced to third on Adam Jones' single before scoring on Nick Markakis' sacrifice fly.

Pie has been plagued by left shoulder injuries in the past, most recently hurting his arm while throwing to the plate in the Orioles' Opening Day loss to the Rays on April 6.

"It's the same thing," Pie said. "It hurts now, but I'm going to wait to see what's going on with it [Friday]."

Pie has been one of the few bright spots in the Orioles' offense, and entered Thursday's game batting .471 with a homer and an RBI.

"You'd like to be able to have the guy healthy so he can play on successive days and put a little string together," said manager Dave Trembley. "It would appear that it's a situation that keeps creeping up and bothering him on a way-too-frequent basis. So, I'll wait until I get a report from [trainer] Richie [Bancells] and that proper recommendation will be made, and we will go from there."

Pie was 0-for3 in Thursday's 6-2 loss. Nolan Reimold took over in left field in the bottom of the seventh inning.

Mickolio takes Gonzalez's roster spot

OAKLAND -- One of the Orioles' final cuts in Spring Training, Kam Mickolio rejoined the team in Oakland on Thursday, assuming the vacated roster spot of closer Mike Gonzalez.

"I'm not going to dwell too much on what happened [this spring]," Mickolio said. "I'm going to come up here and hopefully show them what I've done is enough to stick around for a while."

Mickolio was praised this spring by manager Dave Trembley for his offseason regimen and early bullpen sessions, even going as far as to say a spot in the bullpen was the tall, powerful right-hander's to lose. But Mickolio's success didn't translate nearly as well into Grapefruit League games. He allowed two earned runs in 9 1/3 innings stretched over eight appearances, with his walk-to-strikeout ratio (7:10) a glaring statistic.

Mickolio was also slowed by a groin injury during the final two weeks of camp and said he wasn't back full-throttle until three days before the roster deadline.

"We ran out of time in Spring Training, so he went to Triple-A," Trembley said. "But we definitely could use the arm, and we definitely could use a power-type pitcher toward the end of the game. He'll get the opportunity and we'll see how he does."

Mickolio projects to be a future closer. Listed at 6-foot-9, 255 pounds, he's also a pretty imposing guy on the mound. The problem for him -- like many big pitchers -- is repeating his delivery, which in turn keeps his control in check. In three innings at Triple-A so far this season, Mickolio has walked four batters, allowed four hits and struck out five.

Uehara throws side session Thursday

OAKLAND -- Koji Uehara threw a side session Thursday and the next step will be for the right-hander to throw live batting practice on Saturday.

Uehara started the season on the 15-day disabled list with a left hamstring strain suffered during a Spring Training game on March 18. Any progression would be welcome news for the depleted Baltimore bullpen, which lost Mike Gonzalez to a left shoulder strain on Wednesday.

Slated to pitch out of the bullpen this year, Uehara went 2-4 with 4.05 ERA in 12 starts for Baltimore last season.