He told the Royals' official website: "I'm looking forward to it because I had great memories there.
"I had a terrific short period there, the club was broken when I arrived and the supporters wanted a new way of playing. They had a disconnection with the team, we pulled it around, pulled it together and became one club.
"After that there was a big projection for this year and I was to move on. I wouldn't have moved to many other places, it was a great opportunity.
"There are good people and good supporters at Watford. I understand anything that comes my way because it's a good sign that we did a good job there."