May (back) was placed on the 15-day disabled list Wednesday with a lower back strain, Rhett Bollinger of MLB.com reports.
May had strung together seven straight scoreless appearances (8.2 IP) before an uncharacteristically poor outing Aug. 6 in which he allowed a home run and threw a pair of wild pitches. The fact that he's been dealing with lower back issues may explain his struggles, and after a few days off, the Twins opted to place him on the DL rather than rush him back. J.T. Chargois was recalled to take May's spot on the active roster.