OAKLAND, Calif. — The Oakland Athletics activated infielder Adam Rosales from the 60-day disabled list Monday and recalled infielder Scott Sizemore from Triple-A Sacramento.Both moves were made before the slumping A’s faced the Baltimore Orioles.To make room for Rosales and Sizemore, the A’s optioned third baseman Kevin Kouzmanoff and right-hander Fautino De Los Santos to Sacramento.Also Monday, the Athletics sent left-hander Brett Anderson (3-6) back to Oakland to have his arm examined by team orthopedist Will Workman.Anderson allowed five runs in five innings against Boston on Sunday. In his previous start, he gave up nine earned runs over 5 1-3 innings against the New York Yankees.Manager Bob Geren wouldn’t discuss specifics about Anderson’s arm, or whether he might miss a start.”It’s just an all-around good idea to have him checked out. Nothing real specific,” Geren said.Rosales, who missed all of spring training with a fractured right foot, batted seventh as Oakland’s starting third baseman on Monday night.”Rosales is a good player, an exciting player,” Geren said. “He brings a lot of energy to the team and plays a lot of different positions.”Sizemore was acquired from the Detroit Tigers on May 27 for left-hander David Purcey. He hit .222 with 10 walks in 17 games with Detroit.In nine games with Sacramento, Sizemore hit .267 with 12 walks and 11 runs scored.Kouzmanoff was hitting .221 with four home runs and 17 RBIs in 46 games. He also had nine errors. “I didn’t see it coming,” Kouzmanoff said. “Obviously, as everybody well knows, I started off slow on both sides of the ball, and I did not play to my potential. All I can do is go down and get my work in and get my reps and try to work my way back.”Geren said, “Kouzmanoff has had a rough start for us both offensively and defensively and he hasn’t played up to what he can do. He will go down to Triple-A and work on his game.”De Los Santos joined Oakland on Friday in Boston and made his big league debut Saturday.

GOODYEAR, Ariz. — A’s closer Andrew Bailey left Monday’s game against the Cleveland Indians with an injury to his right elbow and forearm.

The severity is unknown, but Bailey is scheduled to fly to Birmingham, Ala., and be examined Tuesday by orthopedic specialist Dr. James Andrews.

Taking into account Bailey’s history of elbow trouble, it’s a potentially major blow for the A’s and their two-time All-Star reliever.

With one out in the bottom of the seventh, Bailey threw a pitch to Ezequiel Carrera and then grabbed his elbow. The right-hander exited the game and immediately left Goodyear Ballpark with A’s head trainer Nick Paparesta.

A team spokesperson announced Bailey was experiencing “elbow soreness,” though A’s manager Bob Geren described it after the game as tightness in the forearm.

Later in the day, Bailey said in a text message that he had pain in both his elbow and forearm.

“I don’t really know what’s going on,” Bailey said. “All I know is I’m seeing Dr. Andrews and will have more information after that.”

Bailey underwent elbow ligament replacement (or “Tommy John”) surgery in 2004 while at Wagner College and made a full recovery, winning American League Rookie of the Year honors in 2009.

He was shut down last September when he had surgery, performed by Andrews, to clear out bone chips and spurs in the elbow. It was characterized as a minor procedure, and the A’s were extra cautious in bringing

Bailey along this spring.

He didn’t make his exhibition debut until Thursday against Kansas City, throwing a 1-2-3 inning. Monday’s outing was his second.

“All I know is being that I’ve had (Tommy John surgery) before, it didn’t feel the same,” Bailey said of Monday’s injury. “But obviously, that’s what I first thought when I felt it. I’m hoping it’s not too serious.”

Geren was asked how concerned he was.

“Any time you see somebody leave a game with tightness, it’s concerning,” Geren said. “But we’re going to reserve judgment until he gets checked out.”

Asked if Bailey showed any signs of physical problems leading up to Monday, Geren said his closer had “just normal soreness and stuff between outings.”

But Bailey originally was scheduled to pitch Sunday, and Geren acknowledged that Bailey required an extra day of rest: “We gave him whatever time he needed and thought he was ready to go.”

Geren said Bailey’s fastball hit 94 mph Monday.

Brian Fuentes, a four-time All-Star closer whom the A’s signed in the winter to be a setup man, is the logical choice to close if Bailey misses significant time.

The A’s are thought to be challengers in the American League West, and their bullpen depth is a big reason for such optimism.

But their relief corps has been dinged up. Michael Wuertz had shoulder soreness, but he has recovered and is scheduled to pitch in his first game Tuesday.

Craig Breslow, slowed by a hamstring injury, was scheduled to throw off a mound Monday and could pitch in his first game Saturday.

Losing Bailey for any length of time would be a major hit, though it’s fair to say the A’s are better equipped to withstand losing their closer than other teams might be.

• Starting pitcher Dallas Braden allowed six runs (four earned) and seven hits in four innings in the A’s 9-8 loss to Cleveland. And though his defense faltered a bit behind him, Braden didn’t have great command and hasn’t been sharp through four spring starts.

  His ERA is 10.13 in 102/3 innings.

  Despite the numbers, Braden considered Monday a step forward. He said he’s abandoning his curve — an early experiment in camp — and returning to a slider.

  “The positive was his breaking ball,” Geren said. “The negative was his location with the fastball.”

  Braden hit two batters and walked one.

• Chris Carter, who started at first base, drilled two homers for the A’s. The first, a solo shot, hit the scoreboard well beyond the left field wall in the sixth. He added a two-run, opposite-field homer to right-center in the eighth.

  One Indians beat writer said Carter’s first homer was the first he’d seen reach the scoreboard at Goodyear Ballpark, now in its third year.

  “I’m not too familiar with this ballpark,” Geren said, “but I can’t imagine one going much farther.”

• Geren said Rich Harden aggravated his side muscle injury and will visit a doctor.
• Chris Townsend will be back as host of the A’s radio call-in show on KTRB (860-AM), the team announced.

  Former A’s pitcher Mark Mulder was among the candidates to replace Carney Lansford as a Comcast studio analyst for A’s games. But Mulder is believed to be in line for an ESPN gig, and Comcast has yet to announce a hire.