OAKLAND, Calif. -- Oakland Athletics reliever Andrew Carignan said Wednesday night he needs elbow ligament replacement surgery and is in the process of deciding which doctor will do it.
Manager Bob Melvin had hinted earlier in the day that Tommy John surgery was likely for Cardigan after the right-hander left Tuesday's game against Texas in the eighth inning with soreness.
"It is what it is. I know I need surgery; I know I need rehab," said Carignan, who is 1-1 with a 4.66 ERA in 11 appearances for the A's this year. "I had a feeling when I did it, but you never know. I'm here and just getting comfortable and feeling like I belong. That's how things have gone for me."
He underwent an MRI on Wednesday, and Oakland placed him on the 15-day disabled list with a sprained ulnar collateral ligament. He is expected to undergo more tests before a final decision.
But the 25-year-old Carignan -- the A's fifth-round draft pick in 2007 -- already has prepared himself for the logical next step after getting the MRI results. He felt something in his elbow on a 2-2 pitch to Nelson Cruz on Tuesday night, then threw two more pitches and realized he wasn't right.
"It very well could lead to Tommy John," Melvin said. "It's a sprained ligament in his elbow, which is really too bad. I feel for the kid."
Oakland also designated first baseman Kila Ka'aihue for assignment and promoted Brandon Moss from Triple-A Sacramento. Moss had an out clause in his contract if he wasn't in the big leagues by June 15. He went 0-for-3 in his Oakland debut Wednesday night, a 2-0 victory over Texas.
Ka'aihue's wife is due with twins any day, and Melvin called it "very tough" to let him go.
"It was an organization decision based on what we were seeing and what we were hearing," Melvin said of Moss, who was batting .286 with 15 home runs and 33 RBIs for Sacramento. He signed a minor league deal Nov. 19.
Melvin said Ka'aihue handled the news like a pro and said "it might even be a blessing" considering he would be missing some time anyway upon his children's arrival.
Moss received a knock on his hotel room door Tuesday night and thought it was the pizza delivery guy. Instead, River Cats manager Darren Bush told him of the promotion to the big leagues.
And how about his pizza?
"He showed up five minutes later," Moss said. "It was a great 10 minutes in my life right there."
Right-hander Evan Scribner also came up from Sacramento to fill Carignan's vacant bullpen spot. Melvin said he is versatile and could get work in a variety of roles.