The experienced frontman is back in the squad after an ankle injury sidelined the striker for the first three months of the season.
Speaking ahead of a return to one of his former club's Blackpool this weekend, DJ can't wait to get back to showing everyone what he can do.
"It is very good to be back, being injured is not good, especially me, I always want to play football," said Campbell.
"I love playing football so to see the lads playing and I can't help has been tough.
"Especially after last year as well with me being injured after breaking my foot, so I've not actually been able to show the fans what I can do.
"So it is good to be back now and hopefully I can put it all behind me now and I can push on and help the lads get back into the Premier League, that is what we all want."
Signed on a free transfer from Queens Park Rangers in the summer, DJ hit the ground running in pre-season grabbing goals in the games against Rochdale and Preston North End.
But it was during the match at Deepdale where the striker sustained a serious ankle injury to curtail his early summer promise.
"I came back to pre-season fit and raring to go," added Campbell.
"I worked hard to get fit and sharp and pre-season was going well for me. I was scoring goals, we were doing well and winning games and the confidence was high for everyone including myself.
"So to go into the second to last pre-season game and get injured like that was a bit tough for me and everyone else.
"It was difficult, but it is part and parcel of football so you just move on.
"Hopefully I've moved on now, I'm fit and raring to go and get back to playing and scoring goals again."