Liddle played under-19s football for North Melbourne and TAC Cup for the Western Jets.
After being delisted by Geelong, Liddle was an assistant coach for eight seasons with TAC Cup club the Calder Cannons and also Vic Metro in the national under-18 championships.
His duties in that role included "ticketing, retail, licensing and corporate revenues" as well as managing Aligned Leisure, a subsidiary health and recreation business.
[6][7][8][9] Liddle was able to grow the Blues' financial arm considerably during his tenure and under Liddle's leadership as CEO, the Carlton Football Club cleared historical debt, significantly grew membership and commercial revenues, as well as the introduction of new non-traditional revenues.
[10][11] On 10 September 2021, Liddle parted ways with Carlton after he was sacked from his position as CEO.