Watson, who was a product of Forest's famed youth academy, is among hundreds of players who find themselves without a club this summer.
The 21-year-old was Forest's young player of the season in 2009-10, but he saw his progress at the City Ground blighted by a series of unfortunate injuries.
The central defender lost two years of his promising career to injury with Watson forced to undergo five operations to resolve a serious ankle injury.
Watson left Forest in 2012 after cancelling his contract by mutual consent and after spells at Leicester and Telford he is now looking for a new club to rebuild his career.
The former England Under 19 international is now fully over his injury problems and he admits he is prepared to go on trial to prove his worth to prospective employers.
"I'm one of the few players who've had to handle the news that their career's over, but I'm one of the handful who's managed to come back from it and prove most people wrong," Watson told Sky Sports.
"It gives you the drive to just keep going every day. It puts everything in perspective and makes me appreciate how important it is to me to just be playing regular football.
"As a youngster I was called up for England 19s alongside Benik Afobe. Emmanuel Frimpong, Andre Wisdom, Jonjo Shelvey, and Josh McEachran.
"I still feel that's the potential I have and I'm willing to go anywhere that will give me a platform to prove it."