Twins reinstate RHP May, send him to Triple-A Rochester
May had the ligament replacement procedure on March 22 last year after he got hurt during a spring training game. He has a 5.50 ERA in 18 innings with 12 walks and 20 strikeouts in six rehab appearances, including four starts.
The Twins made the move on Thursday, transferring catcher Jason Castro from the 10-day disabled list to the 60-day DL to clear room on their 40-man roster. Castro is out for the rest of the season with a torn meniscus in his right knee.