The Blue Jays signed De Leon to a minor-league contract Monday that includes an invitation to major-league spring training.
He'll presumably get the chance to compete for a spot in the Toronto bullpen this spring, but the 29-year-old is more likely than not to report to Triple-A Buffalo before the regular season gets underway. He posted an 8.35 ERA and 1.80 WHIP across 18.1 innings at the big-league level with the Reds last season before getting released in July and linking up with the Red Sox on a minor-league deal shortly thereafter.