Manager John Farrell also rejoined the team Monday after missing the past 10 games because of pneumonia. Farrell left in the bottom of the ninth inning of an Aug. 26 loss to Kansas City suffering from pains in his side. He did not accompany the team on a recent road trip to Baltimore and New York. Bench coach Don Wakamatsu managed the team in Farrell's absence.
The 29-year-old McGowan hasn't pitched in the big leagues since July 8, 2008, when he came out of a start against Baltimore due to shoulder pain.
Surgery followed soon after and he wasn't able to pitch until the spring of 2010 before more problems surfaced. The former first-round pick had a second shoulder operation last June.
The Jays re-signed McGowan to a one-year deal worth $450,000 back in December. McGowan is 20-22 in his career with a 4.71 earned-run average. His best season was in 2007 when he finished 12-10 with a 4.08 ERA.