From quite early in his playing career, Brereton pursued media appearances in anticipation of joining the media full-time when he retired. During the 1980s, he had a six-year stint on a morning show hosted by veteran television performer, Ernie Sigley, who mentored the ambitious Brereton. In the early 1990s, he joined Channel Nine when the network began showing interest in Australian football for the first time in more than twenty years. He was one of the original panellists when the long-running "The AFL Footy Show" began in 1994 and also wrote in "The Age". In 2000, he moved to the Seven Network to provide match commentary on AFL matches and hosted the show The Game, he stayed at Seven until they relinquished the rights at the end of 2001. In 2002, he returned to the Nine Network to provide match commentary on AFL matches when the network commenced its AFL coverage. He continued to be a regular panellist for "The AFL Footy Show".