Werner made 40 saves on 40 shots in his NHL debut, a 4-0 win against the Winnipeg Jets on Tuesday, after relieving injured starter Pavel Francouz 31 seconds into the game.
With Philipp Grubauer on injured reserve, the Avalanche recalled Werner on Nov. 7. He is 5-4-0 with a 2.88 GAA and .908 save percentage in nine AHL games.
Selected by Colorado in the fifth round (No. 131) of the 2016 NHL Draft, Werner (6-5, 205) made the transition to North America after one full season with Farjestads BK of the Swedish Hockey League.
The 22-year-old was 15-9-0 with a 2.02 GAA and .926 save percentage in 26 regular-season games in the SHL last season. He signed a two-year, two-way contract with the Avalanche on May 13, 2019.