The Avalanche announced today that the organization will officially retire number 21 in honor of former Avalanche forward Peter Forsberg. The Avalanche will raise Forsberg's #21 in a special ceremony prior to the start of the club's 2011-12 season opener on Saturday, Oct. 8 against the Red Wings at Pepsi Center. Forsberg's #21 will be the fourth sweater number retired in the 16-year history of the Colorado Avalanche, joining Ray Bourque (77), Patrick Roy (33) and Joe Sakic (19). Forsberg will be the eighth player in franchise history to have his sweater number retired, as the Quebec Nordiques retired the jerseys of Peter Stastny (26), Michel Goulet (16), Marc Tardif (8) and J.C. Tremblay (3).