Vegas recalled goaltender Maxime Lagace from Chicago of the American Hockey League, and he will be available when the Golden Knights host the Philadelphia Flyers on Sunday (8 p.m. ET; ATTSN-RM, NBCSP, NHL.TV).
"That's the thing about injuries," Gallant said. "If someone steps aside for a while, somebody else gets an opportunity and takes advantage of it. ... For our team, nobody wants to get hurt. It gets people an opportunity and gives other people confidence."
Subban, 24, is 11-3-1 with a 2.59 goals-against average and .912 save percentage in 16 games (15 starts). He missed 13 games earlier this season with a lower-body injury.
Subban made 10 of his starts between Oct. 15 and Dec. 8, when No. 1 goaltender Marc-Andre Fleury was out with a concussion.
The Golden Knights claimed Subban off waivers from the Boston Bruins on Oct. 3. The Bruins selected him with the No. 24 pick in the 2012 NHL Draft; he was 0-2-0 with a 5.81 GAA and .727 SV% for Boston.