But last season's top scorer is set to return from a calf strain this weekend and could have an extended run in the side with Nathan Tyson (calf) and Dexter Blackstock (knee) both injured.
"That is the thing for me, I want to be playing football. I am never happy when I am not," he told the Nottingham Evening Post.
"When I am out the side, whether I am injured or not, I am just horrible. It is not nice.
"I want to be playing, that is my aim. I want to go on and do more than I did last season. I want to be improving all the time, I want to get goals and I want to do well for Nottingham Forest."