Nolasco (0-1) felt pain during Wednesday's 11-0 loss at Detroit. Molitor says an MRI showed no structural damage.
May was 3-6 with a 7.88 ERA in 10 appearances and nine starts last season.
Shortstop Eduardo Escobar was in the lineup against the Chicago White Sox after his fiancee gave birth to a boy — the couple's first child — Friday morning. Molitor says Escobar was planning to head to Minnesota after the game and be back in uniform Sunday.
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