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The 27-year-old originally signed with the A's as a free agent in 2008. Leon spent parts of eight seasons in their Minor League organization, with 69 of his 177 appearances coming as a starter. He likely will have an opportunity to compete for a job in the Blue Jays' bullpen during Spring Training.
Toronto has 39 players on its 40-man roster. If Leon doesn't make the team out of Spring Training, the Blue Jays likely would explore the possibility of using Leon in the rotation at Triple-A Buffalo, as 57 of his 72 Minor League appearances since 2013 have come as a starter.
Gregor Chisholm is a reporter for MLB.com. Read his blog, North of the Border, follow him on Twitter @gregorMLB and Facebook, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.