Heskey said: "I enjoyed myself a lot at Liverpool, it was brilliant. My first two seasons were especially good as I was playing regularly and really well.
"Obviously after that it wasn't so good and I had a lot of ups and downs since then, on and off the bench and with a few injuries.
"It's always nice to have a fresh challenge. It came to a stage at Liverpool where I felt I needed to move on to get going again.
"I don't really think that I have a point to prove though. What sort of point do I need to prove? I will just go out there and play."