England must leave everything out on the pitch as they aim to set the tone for their Rugby World Cup campaign against Argentina on Saturday, though Mike Tindall does not see Steve Borthwick's side as being among the favourites.
The 2023 World Cup gets under way in Paris on Friday, with hosts France taking on New Zealand.
England's campaign starts on Saturday, when they face Argentina in Marseille.
The Red Rose – who were runners-up to South Africa in 2019 – head into the tournament ranked eighth in the world, below Fiji and two places below Argentina.
After a disappointing Six Nations, England will be looking to put things right, and Tindall wants to see a fast start on Saturday.
"The first game against Argentina, they can't leave anything out there," he told Stats Perform. "They're not in a place where they can build something, they have to play [well].
"Imagine that is the World Cup final and then deal with the outcome of it and then rebuild to go into quarter-finals and semi-finals.
"Argentina for England is the World Cup final.
"They have to play the biggest game in their first outing that should get them into a quarter-final and hopefully in that time you build momentum and they can then go on."
Asked if he fancied England's chances of going all the way, Tindall said: "To be honest, at the moment, I don't see them be the favourites.
"I think I think they can muster a challenge, and we are on the right side of the draw. France, New Zealand, South Africa, Scotland, Ireland, they're going to take chunks out of each other, and you don't know what's going to happen injury wise.
"So all you've got to do is try and stay in their strike, manage everything, and ultimately believe and if they can do that, I think they could create a shock. But I don't think that they're going in as anywhere near favourites."
For Tindall, New Zealand or France are the favourites.
He said: "Just from the grouping, I would say the winner coming out of the France, New Zealand group.
"Ireland are number one in the world but the schedule and the draw they're on is terrible. It's terrible for them.
"Even South Africa, who are built for big physical guys, I just think that France and New Zealand have that first big game and then they can sort of relax a little bit.
"Not relax, but they'll be able to manage their players and manage their time. And I feel that the winner could come out with those two."