The Blue Jays optioned Cuas to Triple-A Buffalo on Wednesday.
Cuas will head back to Buffalo to make room on the active roster for right-hander Paolo Espino, who was called up from Triple-A to start Wednesday's game in Baltimore. The righty reliever's latest stint with the Blue Jays lasted just two days, with Cuas striking out one but walking three batters in a scoreless inning of relief in Tuesday's 6-2 loss.