The Red Sox recalled Bello from Triple-A Worcester on Sunday.
The right-hander was in the mix to be called up for a spot start Saturday, but Boston instead turned to Eduardo Rivera to fill Ranger Suarez's (groin) rotation spot. Bello will still join the big club for the final game before the All-Star break and will be available out of the bullpen, with interim manager Chad Tracy suggesting that the 27-year-old could be called upon to cover multiple innings in relief since starter Payton Tolle will likely be in line for a shorter outing by design Sunday, per Jen McCaffrey of The Athletic. Since being optioned to Worcester in early June, the 27-year-old posted a 4.34 ERA, 1.43 WHIP and 22:4 K:BB across 18.2 frames in four starts after struggling to a 6.34 ERA in 12 outings for the Red Sox.