The 30-year-old defender was a part of the Hornets side that got promotion five years ago.
"I absolutely feel the promotion was mine," he is quoted as saying by Watford Observer.
"I think a lot about those days and harbour a lot regrets because my career changed for the worse since I left Watford. I have regrets because I feel that I deserved a chance to play and test myself in the Premier League.
"My former partner [Craig] Cathcart, who went on to prove that he is a quality player, got a chance and I think that I also warranted a chance to showcase my skills because I definitely feel not inferior to him or to anyone else that came after me. But that's how football is. There are many components that describe and influence a footballer's career.
"That said, I am sure I could have held my own with Watford in the Premier League and I also made those feelings known within the club before I left for QPR. But I did not only say it, I also did my talking on the pitch in the few games that I played in pre-season, such as in the old Capital One Cup.
"By putting in a great performance that day I proved that I could cut it at the highest level. But then a new manager came in. Initially Quique Sanchez Flores told the media that I was good enough for the Premier League, then he sold me."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!