The bad news just keeps coming for the Red Sox.

Prior to Wednesday’s game, the club announced right-hander Brayan Bello is being placed on the 15-day injured list with right lat tightness. To fill his spot on the roster, the club is recalling right-hander Zack Kelly from Triple-A.

The club’s Opening Day starter, Bello is among several Red Sox standouts who the team really can’t afford to be without. The 24-year-old recently signed a six-year contract extension that will keep him in Boston through the remainder of the decade, and through his first five starts Bello had posted a 3.04 ERA over 26.2 innings.

He, along with Tanner Houck, Kutter Crawford and Garrett Whitlock, also helped form what has been among the best starting rotations in baseball through the season’s first month. Entering Wednesday, the club’s starters collectively boasted a 1.80 ERA, the best mark in baseball by a significant margin.

Bello now joins fellow rotation-mates Lucas Giolito, Nick Pivetta and Whitlock on the shelf, along with fellow up-and-comer Triston Casas, who is expected to miss significant time with a fractured rib. All told, the Red Sox have 13 players on the injured list, and that doesn’t even include Tyler O’Neill or Rob Refsnyder, who were both activated earlier this week, or Rafael Devers, who has missed 11 of Boston’s first 24 games due to various ailments.