Manager Bryan Price says Phillips is day to day. Skip Schumaker got the start at second in the series opener at Wrigley Field on Monday night.
Phillips got hurt on a backswing during Sunday's 4-3 victory over Toronto. He left in the fifth inning.
Phillips, who turns 33 on Saturday, is batting .274 with five homers and 33 RBIs in 72 games this year.
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