Asher (shin/suspension) will begin his rehab assignment Tuesday at Rookie League Gulf Coast, Stephen Gross of The Morning Call reports.
Asher hasn't pitched since May 17 and is currently serving an 80-game suspension for PED use at Triple-A Lehigh Valley. Before that, he had a 2.30 ERA and was holding batters to a .193 average over 54.2 innings split between Double-A Reading and Lehigh Valley. If all goes smooth in his recovery from a shin fracture, Asher could be a September call-up, looking to improve on his 9.31 ERA over 29 innings in the majors from 2015.