Eddie Jones says England's Six Nations finale against Ireland in Dublin will be "like a World Cup final" given the prizes at stake.
Ireland are the last remaining obstacle in the way of a second straight Grand Slam and the record for most consecutive tier one Test wins.
Jones told Sky Sports News HQ the pressure on Saturday's performance is ideal preparation as England continue to work towards a World Cup challenge in Japan in 2019.
"We've got to be really well prepared," he said. "The more preparation we have, the more knowledge we have of what Ireland are likely to do we can anticipate, react with speed and create pressure.
"It's a great opportunity and a great experience. We're building up to a World Cup and this is like a World Cup final - winner takes all. To have this experience is only positive for us."
Jones acknowledged the opposition have made this year's tournament "immeasurably harder" than it was 12 months ago and rejected Sir Clive Woodward's view that the title alone - without a Grand Slam - would represent failure.
Jones said: "If we were to get beaten - and we won't - is it a failure? We're still Six Nations champions.
"We'd be disappointed. This is a once in a lifetime opportunity."
Jones is confident Elliot Daly will be fit as the winger goes through a return-to-play protocol following a possible concussion in the 61-21 win over Scotland.
The England squad enjoyed a drink in celebration of that result and the championship. Jones said: "You've got to enjoy the occasion, but everyone understands this week is the biggie."