Williamson started in left field against the Chicago Cubs on Friday after being sidelined since April 24 because of a concussion. He was hurt when he stumbled on a bullpen mound and crashed into the left-field wall chasing a fly ball during a home game.
Williamson was batting .316 batting with three home runs and six RBIs in five games.
Osich has an 8.25 ERA in 12 relief appearances.
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