Cleveland selected Allen's contract from Triple-A Columbus ahead of his scheduled start Sunday versus the Marlins at Progressive Field, Zack Meisel of The Athletic reports.
The left-handed hurler will be making his MLB debut after impressing over his three appearances for Columbus with a 1.26 ERA and 1.05 WHIP across 14.1 frames. The Cleveland rotation is currently without Triston McKenzie (shoulder) and Aaron Civale (oblique), so Allen could have a path to making multiple turns through the rotation if he's able to acquit himself well in Sunday's outing.