Michaels, who has two hits in 18 at-bats this year, injured his shoulder while diving for a ball in the outfield on April 24 at Milwaukee. He took batting practice on the field Thursday afternoon and said he was ready to go.
"The more at-bats I get, the better," he said. "But it felt good today."
Michaels, the club's fourth outfielder, batted .253 with 14 doubles, eight home runs and 26 RBIs in 106 games last year and had a terrific spring. He's struggled at the plate so far this season, but has started just three games in left field.