Rowley was recalled from Triple-A Buffalo on Sunday, Mike Wilner of Sportsnet 590 The Fan reports.
Rowley had previously made three starts for the Blue Jays before being demoted to Buffalo on Aug. 23 after manager John Gibbons opted to replace him in the rotation with Tom Koehler. With the Blue Jays having since added Brett Anderson to the 40-man roster to fill out the back end of their rotation, both Koehler and Rowley will be ticketed for bullpen roles in September, likely seeing most of their usage in lower-leverage scenarios.