The Republic of Ireland international was able to play in his side's 2-0 defeat against Watford due to his rapid recovery from an ankle injury
The 25-year-old Republic of Ireland international suffered damaged ankle ligaments at the end of November during a tie against Wolverhampton Wanderers and was expected to miss at least two months.
However he has returned to match action faster than first anticipated, thanks to a mature approach to recovery, making an appearance in his side's 2-0 defeat to Watford on Saturday December 22.
In the build up to the game, Forest manager Sean O'Driscoll remarked that the striker was 'raring to go', and Cox said that he pushed himself in order to aid his recovery.
"When I had the scan results and it seemed as though it was going to be a long time out for me, there was not much I could do here," Cox told the Irish Examiner.
He continued: "There are only so many weights you can lift, so much ice you can put on. So I was allowed to go away for a week and get some sun, which was nice, because it was cold over here.
"I took a couple of machines with me. I took crutches, a special boot and a machine that electronically exercises your thighs so that they don’t diminish while you are out."
He added: "I have to manage things, I have to monitor things carefully in training. As long as I have no adverse reactions, I should be fine, and I have not had any so far.
"It is just one of those things. My feeling is that, if an injury feels okay, I will push myself," concluded the former West Brom striker.