Coleman was promoted to Triple-A Buffalo on Sunday, Mitch Bannon of The Athletic reports.
Coleman will make the jump to the Triple-A level after posting a 2.88 ERA and 1.20 WHIP with 37 strikeouts over 25 innings in 18 appearances with Double-A New Hampshire this season. If the southpaw impresses with Buffalo, there's a strong chance that Coleman will get a shot with the major-league roster this year.