Allen will be called up from Triple-A Columbus to start one game of Monday's doubleheader against the Royals, Zack Meisel of The Athletic reports.
Cleveland hasn't officially announced its starters for the twin bill, but Allen and Joey Cantillo appear set to take the hill in some order. Allen has made 19 starts for the Guardians this season and has a 5.56 ERA, 1.54 WHIP and 78:37 K:BB across 92.1 innings.