Demko replaces Jacob Markstrom, who has started 14 consecutive playoff games for the Canucks but allowed three goals on four shots in the third period of Sunday’s 5-3 Game 4 loss.
Louis Domingue will back up Demko.
The 24-year-old Demko started 25 games for the Canucks during the regular season, posting a 13-10-2 record with a 3.06 goals-against average and a .905 save percentage.
While he made an appearance in relief of Markstrom in Game 1 of the series, Demko hasn’t started a game since March 10 — a 5-4 win over the New York Islanders in which Demko made 45 saves.
Robin Lehner will start in net for the Golden Knights.
The puck drops on Game 5 at 6:45 p.m. PT/9:45 p.m. ET on Sportsnet, CBC and SN Now.