Breen was assigned to the
Milwaukee Mustangs of the
Arena Football League (AFL) on October 14, 2011. He was activated on July 4, 2012. He played in four games for the team during the
2012 season. Breen was assigned to the AFL's
Cleveland Gladiators on November 8, 2012. He started eighteen games for the Gladiators in 2013. He played in sixteen games for the team during the
2014 season, garnering second-team
All-Arena accolades as a center. He also participated in the
AFL China exhibition games in
Honolulu, Hawaii, and
Beijing, China, in 2013. Breen signed with the
Montreal Alouettes of the
Canadian Football League on June 4, 2014. He was released by the Alouettes on June 10, 2014. He started seventeen games for the Soul in 2015, earning first-team All-Arena honors. He was also named the
Spalding Offensive Lineman of the Year. ==Coaching career==