Freel was on second base when the throw hit him in the right side of the head during the third inning of the 12-1 loss Monday to the Boston Red Sox. A backup outfielder, Freel was batting .133 batting in nine games.
The Orioles recalled outfielder Lou Montanez from Triple-A Norfolk to replace Freel. Montanez made his major league debut with Baltimore last season, batting .295 in 38 games.
Baltimore also recalled right-handed starter Brad Bergesen from Norfolk. Bergesen was to make his major league debut Tuesday night against the Chicago White Sox.