The Cardinals recalled Leahy from Triple-A Memphis on Saturday.
Leahy owns a 4.02 ERA and 1.02 WHIP through 47 innings with the Cardinals this season, and he's given up just one earned run across 5.2 Triple-A frames since making his last MLB appearance Sept. 6. He'll come up to give the Cards some additional bullpen depth as Sonny Gray (forearm) heads to the IL.