Cusack made his National Rugby League premiership début with the Sydney Roosters in the 1998 NRL season. A front-rower, Cusack was one of the last remaining top-level league players to hold a job outside football, working part-time as a plumber.
Cusack's entry into the National Rugby League premiership marked his début with the Sydney Roosters in the 1998 NRL season. As a prop, Cusack was among the few elite league players still employed outside of football, holding a part-time position as a plumber.