The cosmic ideal for the modern-era emergency swingman-type, Criswell provides the Red Sox with some additional depth heading into Saturday’s twin bill against the Guardians at Progressive Field. The 28-year-old is capable of gobbling up multiple innings, if needed, and will likely head back to Triple-A Worcester at the conclusion of the doubleheader.

Criswell struck out four in four hitless innings against the Nationals’ Triple-A affiliate in his second appearance since being sent down by the Red Sox. The right-hander, who had a 10.38 ERA in three major league relief appearances to begin the year, will likely be up and down between Boston and Worcester a few times this year.

Criswell got a three-inning save to finish Sunday’s doubleheader, but he’s given up eight runs — four earned — in 4 1/3 innings this season, and he’s struck out zero of the 27 batters he’s faced. He’ll be back at some point.

He gave up back-to-back homers to Ernie Clement and Davis Schneider in the second. Criswell entered the spring as perhaps the top alternative on Boston’s SP depth chart, but he’s probably been passed by Richard Fitts and Quinn Priester, both of whom have impressed in camp. Fortunately for the Red Sox, they were awarded a fourth option on Criswell in the offseason, allowing them to stash him in Triple-A if they’d like.