Saucedo's contract was purchased from Triple-A Buffalo on Saturday, Mitch Bannon of SI.com reports.
A big 6-foot-5 southpaw, Saucedo had a 2.29 ERA and 21:2 K:BB in 16.1 innings over 10 appearances at Triple-A. Toronto's bullpen has been decimated by injuries, so if Saucedo can carry over that success against big-league hitters, he could work his way into the later innings.