Now 28, Mellor is in the best form of his career for Phil Brown's Preston.
"I want to play as high as I can." he told the Liverpool Echo. "I am 28, and I want to play back in the Premier League one day. I see some players doing it now and think 'I could do that'.
"I would love people to see me going from Liverpool, seeing me fall down the leagues a bit, looking like my career was going nowhere, and to see me fight back.
"Hopefully I can fulfil the potential I showed at Liverpool. I feel as though I'm a better player than I was, and I know that I can score goals at a higher level. Certainly the Championship and hopefully the Premier League.
"I believe that I will play at a higher level again.
"Hopefully with Preston next year."
And a return to Anfield one day?
"It is a strange one, but growing up around Liverpool means I wouldn't really want to play against them.
"I wouldn't mind playing at Anfield again for Liverpool, but not against them!"