Annunen is expected to start on the road against Colorado on Thursday.
Annunen has a 2-1-0 record, 3.89 GAA and .846 save percentage in three outings this season. He stopped 22 of 26 shots en route to a 5-4 shootout win against Tampa Bay in his last start Saturday. The Avalanche are tied for first in goals per game with 4.13 this season.