Thornton was optioned to Triple-A Buffalo on Tuesday.

Thornton owns an unremarkable 4.60 ERA in 47 major-league innings this season. He allowed four runs on 11 hits in 7.2 innings of work during his latest stint with the team. He'll head to the minors as the Blue Jays clear a spot for Danny Jansen (hamstring) to return from the injured list.

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