Concepcion signed with Toronto in 2016 for 150K. He reached the Appy League the next summer but hasn’t played since after being suspended 60 games for a PED violation after the 2017 season. He has lost valuable development time but is still only 20-years-old, with size and flashes of a promising fastball/curveball combo that make him a prospect.
Concepcion has a mature 6-foot-5 frame with good overall strength, though his build is more durable than it is athletic. There’s some effort in his delivery, as his arm gets off-line in the back and recoils through a three-quarters slot. The fastball touched 96 mph in my viewing and sat in the mid-90s, showing firm overall life that was at its best when he got both run and sink down in the zone. His curve was a separator, flashing hard depth and good power at 78-to-82 mph throughout the game. It backed up on him at times but showed the ingredients of a potential big league breaking ball. Concepcion’s upper-80s changeup was more crude than his other two pitches, often too firm and lacking much movement. He wrinkled a handful in the 85-to-86 mph range with slightly better finish, suggesting there’s at least a chance for a bit more refinement.
Considering the noise in his delivery, inconsistent third offering, and early-stages pitchability, it’s reasonable to expect Concepcion to wind up a reliever down the road. His better two pitches likely would play up in a short-stint role, with imposing size and velocity that fit in a big league bullpen. He’ll likely continue to work as a starter for now, giving the opportunity to develop his control and changeup through the low minors even if he does ultimately move from the rotation.