Jonathan Woodgate believes leaving Newcastle for Real Madrid was the hardest decision of his career. "I'm disappointed because I am leaving Newcastle before I could show the fans what I can really do," he told the Newcastle Evening Chronicle.
"I'm leaving probably the most exciting bunch of young players in Europe, plus great players like Alan Shearer.
"It was the hardest decision of my career, but I can't miss out on playing with so many great players at Real."
Reflecting on his �13.4 move to the Spanish club the 24-year-old defender added: "I spoke to the chairman and I told him to keep a hold of that number six shirt because I might be back one day.
"And I thanked Sir Bobby Robson and all his staff - both coaching and medical - for all they have done for me in my short stay at the club.
"In my opinion, Newcastle United as a club are on the up and I hope I can look forward to playing for Real against them in the Champions League one day."
Real president Florentino Perez believes the Spanish club have pulled off a major coup in signing Woodgate.
He said: "Jonathan is the correct choice, a magnificent player.
"He is one of the best defenders in Europe and he will be one of the best in the world."
"Real Madrid will help consolidate him in this position and he will help Real Madrid get stronger.
"He's young and a serious player.
"He knows our value and he is coming to a club where every day is a challenge both on and off the pitch.
"Real Madrid and their players have to set an example."
Woodgate has been given the number 18 shirt vacated by Antonio Nunez following his move to Liverpool.