Comrie, who was claimed off waivers from the Winnipeg Jets at the end of September, has yet to appear in an NHL game this season. The 24-year-old has a 4-0-0 record in the AHL this season, with a 2.75 goals-against average and .900 save percentage.
In five NHL games over his career, all with the Jets, Comrie has a 2-3-0 record with a 4.20 goals-against average and .870 save percentage.
The Red Wings placed veteran goalie Jimmy Howard on injured reserve Friday after he suffered a mid-body injury against the Toronto Maple Leafs on Wednesday.
Saarijarvi, 22, was a third-round pick by the Red Wings in 2015. He has yet to play an NHL game and has one assist in 13 AHL games this season.