The Phillies optioned Lazar to Triple-A Lehigh Valley following Sunday's 6-2 win over the Mets, Matt Gelb of The Athletic reports.
Lazar will return to the Triple-A level after he surrendered two runs on three hits while striking out four batters over four innings in three appearances with the Phillies following his call-up Tuesday. Philadelphia is expected to activate left-hander Kyle Backhus (elbow) from the 15-day injured list Monday to take Lazar's spot in the bullpen.