McGowan was recalled from Triple-A Las Vegas on Tuesday.
He'll take the roster spot of Steven Matz (elbow), who was sent to the disabled list in a corresponding roster move. McGowan hasn't played in a game for the big club this season, but he owns a 4.06 ERA and 55:24 K:BB through 62 innings with Las Vegas. He should work in low-leverage situations for the Mets moving forward.