Leon cleared waivers and was outrighted to Triple-A Buffalo, Gregor Chisholm of MLB.com reports.
Leon was DFA'd by the Jays on Wednesday, and he'll wind up in Buffalo after passing through waivers unclaimed. In two appearances for Toronto, Leon allowed two earned runs on three hits.
Leon was designated for assignment Wednesday by the Blue Jays, Ben Nicholson-Smith of Sportsnet reports.
Leon has given up earned runs in each of his two appearances this season and hasn't pitched since April 9. Leon was designated for assignment to make room for Pat Venditte, the switch-pitcher.
Leon was charged with the loss after serving up an eighth-inning three-run homer to Steven Souza Jr., giving the Rays a 5-3 win Wednesday.
The bullpen is supposed to be one of the Blue Jays' biggest strengths this season, but it was a letdown in the final two games of the opening series against the Rays. For the second consecutive game, Toronto's relievers coughed up a lead in the eighth inning. The eighth inning typically belongs to Drew Storen, but he was noticeably absent during the series finale after either pitching or warming up in Toronto's first three games of the season. Brett Cecil and Jesse Chavez also were unavailable for similar reasons.
Leon will open the season in the Blue Jays' bullpen, the Toronto Star reports.
Leon earned a spot on the roster by giving up just who hits in seven scoreless innings this spring. While he will break camp with the Blue Jays, his roster spot will be in jeopardy when Marco Estrada (back) is ready to join the rotation.
Leon was traded to the Blue Jays on Tuesday for cash considerations or a player to be named later.
After designating Leon for assignment shortly before the New Year, the Athletics found a trade partner for the 27-year-old right-hander and will receive either cash or a PTBNL in return. Leon worked a 4.39 ERA out of the Oakland bullpen last season and will likely compete for a spot in Toronto's crowded but unsettled bullpen this spring.
The Athletics designated Leon for assignment Monday.
In order to open a spot on the 40-man roster for free-agent signee Henderson Alvarez (shoulder), Leon was the fall guy. After splitting the 2015 season between the Athletics and Triple-A Nashville, though, he should open spring training with the big club with the intention of landing a role out of the bullpen.
The Athletics have promoted left-hander Brad Mills from Triple-A Nashville and tabbed him to start Friday night in Baltimore.
They have also optioned pitcher Arnold Leon to Triple-A Sacramento and designated fellow righty Taylor Thompson for assignment.
Mills hasn't exactly earned the nod. He has allowed 34 runs on 54 hits in his last 46 innings pitched, which covers seven starts. He is 4-11 with a 4.45 ERA on the year.
|4/13/2016 vs New York|
|Last 7 Games|
|Complete Game Log|
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|More Pitching Stats|
|Minor League Pitching Stats|
|2012||AAA-Sacramento River Cat||3||0||1.77||22||0||0||0||0||35.2||26||9||7||4||2||15||31|
|2013||AAA-Sacramento River Cat||5||3||4.42||12||11||0||0||0||71.1||81||36||35||4||3||13||49|
|2014||AAA-Sacramento River Cat||10||7||4.97||27||27||0||0||0||145.0||170||84||80||12||6||51||128|