Colorado midfielder Brian Mullan has signed a multi-year deal with the club, according to the Denver Post. The veteran joined the club during September of the 2010 season and was vital in helping Colorado win the MLS Cup that season. Brian Mullan is originally from the Denver area and played high school soccer for Regis Jesuit, where he was the 1995 Colorado soccer player of the year. He was part of a trade that sent another Colorado native in Colin Clark to Houston Dynamo in exchange for Mullan and allocation money.

In 2011, Mullan made the headlines for the wrong reasons after an ill-advised tackle broke the leg of Seattle Sounders player Steve Zakuani on April 22 at Dick's Sporting Goods Park. The Colorado native was given a straight red card and a subsequent 10-match ban from the MLS Disciplinary Committee. Mullan was apologetic, and served the 10-game suspension without appealing the punishment. Mullan was handed the longest suspension in MLS history.

Brian Mullan is one of the only players to have won 5 MLS Cup titles, thus being one of the most accomplished players in MLS history. He has won titles with LA Galaxy, San Jose Earthquakes, Houston Dynamo (2), and the Colorado Rapids. A source within the club stated that Mullan's decision for the multi-year contract was to continue playing for his hometown club. At 33 years old, it is possible that Mullan will finish his career with the Colorado Rapids.