Orioles right-hander Brad Bergesen was struck in the right forearm by a line drive and removed after throwing only four pitches against the Twins on Friday.
X-rays were negative and the injury was determined to be a bruise.
Minnesota's leadoff hitter Denard Span hit the drive on Bergesen's fourth pitch of the game.
He finished the 2010 season with a record of 8-12 and a 4.98 ERA.
Orioles' Bergesen Hit By Liner 4 Pitches Into Start