England boss Fabio Capello has vowed to keep his players' 'feet on the floor' after their impressive qualification for next summer's World Cup.
England's 5-1 demolition of Croatia on Wednesday evening confirmed their place in next summer's tournament in South Africa as Group Six winners.
The Three Lions have qualified with a 100 per cent record, but the Italian will not allow his players to get carried away on the back of their impressive recent form.
"We are a good team, we are playing well, but we must keep our feet on the floor," he warned.
"We made the first step but we must work hard because to win the World Cup would be a really strong moment."
Meanwhile, Capello has cited an improved mentality for England's qualification success and general improvement during his 18 months in the hot-seat.
He added: "When I became England manager I was sure the players were really good but I didn't understand why certain players were not the same with the national team as they were with their clubs.
"The first step was when we won (4-1 last year) against Croatia, the confidence came after that.
"We always played well away from home, the problem was Wembley."
Capello has also warned his players that he expects a professional approach before and during the World Cup finals.
Former England manager Sven Goran-Eriksson was widely criticised for being too relaxed at the last World Cup in Germany when he allowed players' families - and in particular high-profile wives and girlfriends - to join them at their training base.
"The players need to meet their wives and girlfriends, but it will be for one day after each game," he said.
"We are in South Africa to play, not holiday."