The Red Sox reinstated Bello (groin) from the 15-day injured list ahead of his scheduled start Wednesday against the Blue Jays.
Boston optioned starting pitcher Josh Winckowski to Triple-A Worcester in a corresponding move, a transaction that may hint that Bello will be installed as a permanent member of the rotation. Bello, who has been on the shelf since sustaining a left groin strain in a relief appearance Aug. 3, built up to 4.1 innings in his second rehab start at Triple-A last Friday, so he shouldn't face any major restrictions as he takes the hill Wednesday.