Heasley's contract was selected from Double-A Northwest Arkansas on Friday, Alec Lewis of The Athletic reports.
The righty is likely to start Friday's game against the Mariners, as scheduled starter Brady Singer (undisclosed) went on the injured list. Heasley has posted a 3.33 ERA and 120:34 K:BB in 105.1 innings across 22 starts at Double-A this year, although the leap to the MLB level could certainly be difficult for the 2018 13th-round pick.