Andy Farrell has revealed it was the opportunity to become a dual international which inspired his move to rugby union as he swatted aside criticism of the switch.
Saracens paraded the Great Britain rugby league captain at Vicarage Road on Thursday afternoon after agreeing a three-year deal jointly funded by the Rugby Football Union.
Farrell said: ''It's the challenge that appeals to me. I'm very excited by the move. Initially I'd like to be like to a success at club level and then I'd like to progress by being a success with England.
''I face a lot of hard work ahead of me but I have the chance to become a dual international and that is something special.
''If I didn't take the opportunity to try and become a dual international then I know I would have regretted it later in life.''
Farrell's move has been met with raised eyebrows by both codes of the sport with his age, lack of union experience and knee injury all counting against him.
But the 29-year-old said: ''Saracens are a club on the up - the way things are going here have impressed me. I want to be a part of their success.
''People are talking about the move being a risk but I know what Andy Farrell is about. I know my attitude and record. If I was a betting man I'd back myself.''
The RFU hope Farrell will be ready for England duty in time for the 2007 World Cup, but the world champions' head coach Andy Robinson insisted there was no rush.
He said: ''Andy's main focus is his involvement with Saracens. After that there are the opportunities England will bring.
''You can have time lines when you want people ready, but the key for Andy is to get fit and used to playing the game.''
England flanker James Haskell insists he will be pushing as hard as possible to be back from a toe injury in time to make his case for a spot in Eddie Jones' side looking to defend their RBS 6 Nations title next year.