The 35-year-old appeared in 952 regular-season games split between seven teams. Shattenkirk has gone unsigned since scoring six goals and 18 assists in 61 games with the Boston Bruins last season.
Colorado will retain 14% of Georgiev's contract, which equates to approximately $476,000. He is in the last season of a three-year, $10.2 million deal.
Mrazek was replaced by Arvid Soderblom in the first period of a 4-2 loss to Winnipeg. The 32-year-old Mrazek is 7-11-1 with a 2.83 goals-against average and .906 save percentage in 20 games this season.
Buffalo Sabres coach Lindy Ruff did not provide a timeline of how long Dahlin might be sidelined. He said he hopes it's short-term "but you never know."
Known as "Johnny Hockey," Gaudreau played the first eight of his 10 full seasons with Calgary, where he developed into one of the NHL's top players. He spent his last two seasons with the Blue Jackets.