Sing joined the Penrith Panthers in 1993, originally as a . After poor form for the Panthers' lower grade sides, he was dropped to the local Penrith competition, where former Panthers' coach Len Stacker moved him to .
In 1993, Sing joined the Penrith Panthers. Initially, he played for their lower-tier squad. However, due to poor form, he was moved down to the local Penrith competition by former Panthers' coach Len Stacker and assigned a new position.