It's unclear what forced Harrell onto the shelf, but the move is retroactive to Aug. 7, making him eligible to return this Monday should he be ready. While the 32-year-old struggled during his brief stint in the majors this season, he owns an impressive 2.08 ERA through 30.1 innings with Triple-A Buffalo. He'll continue to serve as organizational pitching depth once he is activated.

There was nothing in Harrell's 7.11 ERA nor 2.21 WHIP to entice a team to snag him off waivers. Harrell was sharp in four starts for Buffalo (2.11 ERA in 21.1 innings), so he may be called upon again should Toronto find themselves needing an innings eater down the stretch.

Dominic Leone will assume Harrell's spot in the bullpen after the 32-year-old scuffled in his four relief appearances, giving up five runs on 10 hits and four walks in 6.1 innings. Harrell is expected to pass through waivers unclaimed, and if that's the case, he'll likely accept an outright assignment to Triple-A Buffalo and work as a swingman.

The Blue Jays need bullpen reinforcements, so Harrell was summoned prior to the matinee game against the Red Sox. He logged a 2.11 ERA, 1.36 WHIP and 15:8 K:BB in 21.1 innings at Triple-A working as a starter, but will likely serve as a long reliever in the big leagues.