Thanks to two-plus months of excellence, the Flyers have solidified their grasp of an Eastern Conference playoff spot. But that spot could be precarious after another injury to one of their top goalies. Michal Neuvirth, who had been 3-0-1 since replacing the injured Brian Elliott on Feb. 10, had to leave Sunday’s game against the New York Rangers after the end of the first period. The Flyers said he had a lower-body injury, and they won’t know how much time he will miss until at least Monday. Rookie Alex Lyon relieved Neuvirth and stopped 25 of 26 shots, keying the Flyers’ 7-4 win at Madison Square Garden. Elliott is expected to be sidelined for at least five weeks with an abdominal injury, so Flyers general manager Ron Hextall will be on the phones looking for a veteran goalie. Buffalo’s Robin Lehner and Chad Johnson, Arizona’s Antti Raanta, Toronto minor-leaguer Calvin Pickard, and Vancouver’s Anders Nilsson are among the goalies Hextall may pursue before the Feb. 26 trade deadline. Lyon, 25, a former Yale standout who played solidly with the AHL’s Phantoms this season, may be the No. 1 goaltender for a while.