© 2012 MLB Advanced Media, L.P. All rights reserved.

06/07/12 2:11 AM ET

A's turn to Moss at first as Ka'aihue designated

Reliever Scribner recalled with Carignan headed to DL

OAKLAND -- The A's revolving door at first base kept turning Wednesday when Kila Ka'aihue was designated for assignment and Brandon Moss was promoted from Triple-A Sacramento.

In another move, the A's placed right-handed reliever Andrew Carignan on the 15-day disabled list with a sprained ulnar collateral ligament in his right elbow, and he's headed for Tommy John surgery. Right-handed reliever Evan Scribner was called up from Sacramento.

Moss has spent most of his career as an outfielder and has made only two Major League appearances at first base, both in 2008 with the Boston Red Sox. But he made 13 appearances this season at first for Sacramento.

Moss, 28, was batting .286 with 15 home runs -- second most in the Pacific Coast League -- and 33 RBIs in 51 games for Sacramento. He hit four home runs in his past five games for the River Cats.

According to Melvin, Moss had a clause in the Minor League contract he signed with Oakland that would have allowed him to become a free agent if he hadn't been promoted by June 15. The A's needed to open a spot for Moss on their 40-man roster, prompting the decision to designate Ka'aihue for assignment.

Moss was in the starting lineup Wednesday night against the Texas Rangers, batting seventh and playing first base. He went 0-for-3 in the A's 2-0 win but made a couple of nice plays, including digging out a long one-hop throw to retire Adrian Beltre in the sixth.

"He's been playing [first base] for a while [at Sacramento]," Melvin said. "And if you look at the numbers, a guy with a lot of power. We do need guys here with power. I think one of the reasons [for] the timing of it is he did have an out on the 15th of June, and based on the fact he was doing what he was doing and a little bit of the lack of production that we've had here, we felt it was the right thing to get him here.

"It was very difficult to let Kila go. Sometimes you just have to make tough moves, and today was one of them."

Ka'aihue batted .234 with four home runs and 14 RBIs in 39 games with the A's.

Brandon Allen, Daric Barton and Ka'aihue each tried but failed to hold onto the starting job at first base. Now Moss will get a chance, and all eyes will definitely be on him when he's in the field.

"Obviously I'm not a Gold Glove first baseman, but I've played there a good bit," Moss said. "I played there in winter ball a good bit and I played there for a few years in the Minor Leagues with the Red Sox, so it's not completely foreign to me, but I'm not going to be Daric Barton defensively over there, but hopefully I do well. I think I will."

Moss has spent time with Boston, Pittsburgh and Philadelphia. He's a .236 career hitter with 15 home runs and 78 RBIs in 249 games.

Melvin said that delivering the news to Ka'aihue was rough, in part because the first baseman's wife is pregnant with twins and expected to give birth soon.

"He's a class act and I wish him the best," Melvin said. "If he doesn't end up being picked up by somebody else we certainly would like to have the chance to potentially see him here again. You have tough conversations like that over the course of the season and that was one of them."

Carignan headed for Tommy John surgery

OAKLAND -- A's right-handed reliever Andrew Carignan landed on the 15-day disabled list Wednesday with a sprained ulnar collateral ligament in his right elbow, and he's headed for Tommy John surgery.

Carignan confirmed manager Bob Melvin's worst fears after the A's 2-0 victory over the Texas Rangers.

"See you next year," Carignan told reporters.

Carignan said he has yet to select a surgeon.

Right-handed reliever Evan Scribner was called up from Triple-A Sacramento to take Carignan's place on the roster.

"I really feel for the kid," Melvin said before the game. "He's worked hard and finally we're seeing some really good results."

Carignan left Tuesday night's game against Texas in the eighth inning after facing three batters. He had been recalled from Sacramento on May 27 for his third stint with the A's this season. Since then he didn't allow a run in four appearances, covering 3 1/3 innings. For the season he is 1-1 with a 4.66 ERA.

Scribner, who was with the A's when they opened the season in Tokyo, went 3-0 with a 3.31 ERA and six saves at Sacramento.

Crisp returns to starting spot in A's outfield

OAKLAND -- A's center fielder Coco Crisp returned to the starting lineup Wednesday night against the Texas Rangers after a three-day break.

Manager Bob Melvin said he kept Crisp out of the lineup in part to give him a mental break but also to give outfielder Collin Cowgill an extended stretch of playing time in the outfield. Cowgill, who homered on Tuesday night, is batting .257 and has a career-high eight-game hitting streak.

"We were playing a hot hand in Cowgill," Melvin said. "I told Coco that this would be the day that he'd come back. He sat for three days or whatever, and we gave Cowgill a chance to ramp up the offense, which was struggling. Coco is a guy we need. We need him at the top of the lineup. We need him producing, on base, stealing bases, creating havoc the way he and [Jemile] Weeks did last year.

"We'll pick our spots. I just felt like it was time for Cowgill to get an extended look. He did well, and we expect Coco to get in there and pick it up."

Crisp went 0-for-4 in the A's 2-0 win, lowering his average to .158.

Melvin said it was tough to take Cowgill out of the lineup but that it's critical for Crisp to get untracked.

"He's a guy that we signed here for two years for a reason," Melvin said. "And you can't just sit him down and not play him. At certain times when guys are struggling you do this, but it's his day today, and we expect him to get on it today."

Crisp had a long stint on the disabled list earlier this season with an inner ear infection. Since coming off the DL he has hit .106 over 14 games, going 5-for-47.

Eric Gilmore is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.