Yankees reliever Joba Chamberlain has undergone an MRI exam for a strained muscle near the rib cage.
New York manager Joe Girardi on Tuesday said doctors were examining the results of Monday's test on the left side of his upper body. He said the right-hander will not pitch for at least the next few days.
"They want to go slow," Girardi said. "Anything dealing with an oblique, there's concern."
Chamberlain had treatment on the Yankees' off day Tuesday.
Pitcher Sergio Mitre is expected to throw off a bullpen mound today. He was scratched from his scheduled start Monday night against Boston because of a sore left upper body muscle.
Bartolo Colon, competing with Freddy Garcia, Ivan Nova and Mitre for one of two open spots in the rotation behind CC Sabathia, Phil Hughes and A.J. Burnett, allowed four hits and struck out seven in six scoreless innings of a simulated game.
"As the time goes by, I feel better and better," Colon said through a translator. "Everything is good. I need to continue to work, and make the decision tough."
>Bailey will recover
GOODYEAR, Ariz. -- The Oakland Athletics breathed a sigh of relief Tuesday after learning that closer Andrew Bailey does not have a serious elbow injury as was feared.
Bailey, who has a strained forearm, will resume throwing once the discomfort subsides.
Bailey left Monday's game in the seventh inning against Cleveland in Goodyear, Ariz., grabbing his elbow after throwing a pitch to Ezequiel Carrerra.
>Snell hangs 'em up
JUPITER, Fla. -- Ian Snell decided to retire at age 29 after the St. Louis Cardinals optioned him to the minors.
The right-hander signed a minor league deal in January after going 0-5 with 6.41 ERA in 12 games, eight of them starts, for the Seattle Mariners last season.