Ex-Liverpool, Wigan striker Heskey ready for Newcastle Jets opener
"My fitness is not too bad. I have been doing a bit with (Wigan's) development group, their Under 21s - they are young lads and they keep you fit," Heskey said.
"But I haven't played any games and everyone knows match fitness is different to training every day.
"But I spoke to everyone here and we will be working towards that first game.
"That is what we will be building for to see if I can play. I am here to play."