Swindle, a 24-year-old left-hander, was 1-0 with a 1.93 ERA in 18 games with Triple-A Lehigh Valley.
Manager Charlie Manuel said late Tuesday that Swindle was brought up because the Phillies are without Clay Condrey, who won't likely rejoin the team until Thursday. He is in Texas with his wife, who is having a baby.
Brett Myers agreed to be optioned to Triple-A Lehigh Valley on Tuesday, which left a vacancy in the starting rotation. Manuel is expected to announce Wednesday who will fill that rotation spot. Reliever Chad Durbin is one of the likely candidates.
Ryan Lavner is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.