The goalie has missed five games with an upper-body injury and has not played since making 29 saves in a 4-3 win against the Los Angeles Kings on Feb. 7.
"I don't anticipate him traveling," Golden Knights coach Peter DeBoer said Thursday. "He's getting better day by day, and I expect him back sooner rather than later."
Lehner was not on the ice for the Golden Knights' practice in Lake Tahoe on Friday. DeBoer was not asked about Lehner's status afterward.
Lehner is 3-1-1 with a 2.96 goals-against average and .890 save percentage in five games this season. He signed a five-year, $25 million contract ($5 million average annual value) with Vegas on Oct. 3, 2020.
Goalie Marc-Andre Fleury is expected to make his sixth straight start with Oscar Dansk the backup. Fleury lost his two previous outdoor games (2011 Winter Classic; 2014 Stadium Series, each with the Pittsburgh Penguins).
"I haven't had a chance to go out there yet but really looking forward to it," Fleury said Sunday. "Those games are always fun. ... I think it's the best hockey to play. Growing up, I always loved to play outside. ... Been in a few outdoor games and always a good time."
Fleury is 7-2-0 with two shutouts in nine games (seven starts) this season. He is second in the NHL with a 1.56 GAA and .937 save percentage among goalies to play at least five games, behind Jaroslav Halak of the Boston Bruins (1.38 GAA, .938 save percentage).
NHL.com independent correspondent Danny Webster contributed to this report
