The Red Sox are calling up left-hander Matt Dermody to start tomorrow night’s matchup with the Guardians, tweets Ian Browne of MLB.com. Pete Abraham of the Boston Globe first noted that Dermody had a locker in the Boston clubhouse. He’s not on the 40-man roster, so the Sox will have to formally select his contract before the game.

Dermody signed a minor league deal with Boston over the winter. He’s worked primarily from the rotation with Triple-A Worcester, starting eight of nine appearances. While the southpaw’s 4.50 ERA isn’t eye-catching, he’s posted solid peripheral marks.

The 32-year-old has punched out just under a quarter of opposing hitters against a meager 4.7% walk rate. He has induced grounders at a decent 45.3% clip. A lofty .346 batting average on balls in play and middling 67.8% left-on-base rate have inflated his run prevention figure despite his other solid numbers.

Of course, Dermody isn’t a lock to carry over those decent rate stats against big league hitters. This will be his first MLB start. Dermody has only ever worked out of the bullpen at the big league level, with virtually all of that experience coming six years ago for the Blue Jays. He carries a 5.60 ERA with an 18.2% strikeout percentage in 27 1/3 MLB frames.

Dermody still has a pair of minor league options remaining. The Red Sox can send him back to Worcester at any point without exposing him to waivers. It’s possible this is just a spot start, although Boston has a rotation vacancy after losing Chris Sale to the injured list last week. The Red Sox turned to swingman Kutter Crawford today, but he was tagged for three runs in as many innings while taking the loss to Cleveland.

Boston already has an opening on the 40-man roster after designating Raimel Tapia for assignment on Monday. They’ll only need to create space on the 26-man active roster to accommodate Dermody’s promotion.