He began commentating on television through the Amco Cup on Channel Ten with Keith Barnes in 1974. In 1980, Ten approached Warren to call the Melbourne Cup, the first of three Cups he would call for the network. He also became Network Ten's chief Rugby League caller in 1983. In 1984 he was to head up Ten's commentary for the Los Angeles Olympics but refused to take the mission. As a nervous flyer, Warren had grave reservations about the trans-Pacific haul and suddenly realised he could not get onto the plane. In 1986, Warren was fired by the network, primarily because it wanted to replace him as its chief rugby league commentator with former international player Rex Mossop.