The Phillies recalled Mercado from Triple-A Lehigh Valley on Monday, Matt Gelb of The Athletic reports.
He'll take over the roster spot vacated by Jose Alvarado, who has been placed on the restricted list as he deals with a personal matter. Mercado was moved to the bullpen at Lehigh Valley after being demoted around the All-Star break and has collected a 2.92 ERA and 12:8 K:BB over 12.1 frames covering his last 10 appearances.