Bello is set to pitch in bulk relief behind opener Tyler Samaniego during Friday's game against Cleveland, Ari Alexander of 7 News Boston reports.
Bello will follow an opener for the fourth time in his last five outings, a strategy that has led to great success for the 27-year-old. He's posted a minuscule 0.98 ERA and 1.04 WHIP with 17 strikeouts over 18.1 innings in his three appearances out of the bullpen so far this season.