He said: "The secret of sustained success is that there is always something new. In Poland and Ukraine it was doing what nobody had done before.
"Now there is the chance to win the World Cup in Brazil: what more of a challenge could there be? A Brazil finals is unique; it is a massive extra in terms of motivation.
"Maybe after winning two Euros and a World Cup you would think there would be nothing else to strive for; then this comes along. It's a gift."