Answer
Yes, Vladislav Tretiak’s number has been retired by his main club team, CSKA Moscow. Tretiak’s number 20 was retired by CSKA in 1984, after he had won 3 Olympic gold medals and 10 World Championships with the team. Tretiak is considered one of the greatest ice hockey goaltenders of all time, and his number 20 is one of the most revered numbers in the sport.