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05/28/12 7:55 PM ET

Roberts could be back with O's in June

TORONTO -- Manager Buck Showalter is pleased with the progress that second baseman Brian Roberts is making on his road to recovery.

Roberts, who played just 39 games last season because of concussion-like symptoms, is on a rehab assignment and could rejoin the club at some point in June, though Showalter did not speculate on an exact date.

"He's doing well and got back in the lineup [on Monday] after playing last night," Showalter said.

Roberts has played five games for Double-A Bowie and is hitting .222. Showalter plans to have him go through the entire Minor League chain before returning to the bigs.

"The plans are -- not to get to far ahead -- [for him] to play with [Triple-A] Norfolk for about a week," Showalter said. "We talked about wanting him to really finish up competition-wise in Triple-A. That's just tentative."

Roberts, once known as one of the top second basemen in baseball, has been out so long because of what doctors now know about concussions.

"We're getting better and better at things from where that is concerned," Showalter said. "There is so much unknown about it, still. I feel like we have been very cautious and leaning on the doctors. ... I applaud it. It's something we should have been better at all along.

"When someone used to have a concussion, you would hear they would play [the next day]. That's not right."

Roberts is a .281 career hitter with a .353 on-base percentage over parts of 11 seasons in the Majors.

O's get Reynolds back but lose Pomeranz

TORONTO -- The Orioles reinstated slugger Mark Reynolds from the 15-day disabled list and placed right-handed reliever Stu Pomeranz on the 15-day DL, retroactive to May 26, with a torn left oblique.

Reynolds, who has not played since May 10 because of a strained left oblique, was in Monday's lineup as the designated hitter, batting eighth.

"Everybody was glad to see him. I know he's glad to be back," manager Buck Showalter said. "He's ready to go."

In two rehab games at Double-A Bowie, Reynolds went 1-for-7 with two walks and four strikeouts. Showalter plans to use him at multiple positions, including first and third, but will make that determination based on matchups.

Reynolds, now in his second season with the Orioles, struggled over 27 games before landing on the DL, hitting just .191 with a .661 OPS and two homers. The 28-year-old hit 30-plus homers in each of the past three seasons.

Though Showalter is glad to have Reynolds back, he is disappointed that Pomeranz's MRI revealed a tear.

"Not very encouraging," he said. "He has a pretty good tear in there. I don't think that will be an imminent DL return, that's the early read on it.

"It's a kick in the pants losing Pomeranz. He was a big help to our bullpen as a guy who could pitch multiple innings."

Pomeranz, who made his Major League debut on May 7, has made three appearances and has a 3.00 ERA. The 27-year-old logged multiple innings in two of his three outings, including Sunday's loss to the Royals, in which he sustained the injury.

Worth noting

• Endy Chavez, who hasn't played since May 8 because of an injured left oblique, is expected to be activated on Tuesday. Manager Buck Showalter said that everything has has checked out well with the outfielder and that he is on his way to Toronto.

• Matt Lindstrom, who partially tore a ligament in his right middle finger, is getting close to heading to Saratosa, Fla., for a rehab assignment. Showalter said that Lindstrom is throwing from distances of 60 feet and 90 feet.

• Taylor Teagarden will be re-evaluated by Dr. Andrew Dossett in Dallas and then head to Saratosa to continue rehabbing his injured back. Showalter expects Teagarden to be looked at on Monday or Tuesday.

Chris Toman is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.