The Phillies recalled Lazar from Triple-A Lehigh Valley on Tuesday.
Lazar has given up four earned runs over five innings at Lehigh Valley since the beginning of June, but he'll end up back in the majors following Brad Keller's (forearm) move to the injured list. The 27-year-old righty has yet to appear in a big-league game this season, though he owns a 4.75 ERA in 55 career innings and will likely be limited to middle relief as long as he's with the Phillies.