BOSTON — Brayan Bello (right shoulder strain) is likely to return from the 15-day injured list to start Tuesday's game against the Seattle Mariners .
The 25-year-old threw a bullpen Saturday.
"The way we're mapping it out, most likely he'll be with us Tuesday," manager Alex Cora said before Boston's game against the White Sox on Sunday .
Bello was slowed at the beginning of spring training with right shoulder soreness.
He has allowed 11 earned runs in 14 innings over four rehab starts (three starts for Triple-A Worcester and one for Double-A Portland). He has given up 18 hits and four walks while striking out 21.
Other Red Sox injury updates
~ Catcher Connor Wong ( pinky fracture ) is hitting off the Tee.
"He has some defensive work in a little bit so trending in the right direction, feeling a lot better," Cora said.
~ Starter Richard Fitts (right pectoral strain) played catch Sunday.
~ Kutter Crawford (right patellar tendinopathy) will go to Fort Myers Thursday to likely begin throwing in extended spring training games.
~ Lucas Giolito will make another rehab start for Double-A Portland on Sunday at Hartford.
"We'll wait and see. Probably he'll have another one," Cora said.
Giolito has allowed four runs, nine hits and seven walks while striking out nine in 7 ⅔ innings over three rehab starts. He struggled Tuesday .

