Leicester Tigers prop Dan Cole believes England have plenty of work to do ahead of their next World Cup encounter despite the Red Rose picking up a bonus-point triumph over Fiji.
England ran out 35-11 winners at Twickenham and secured the bonus point after a late try from Saracens and Aviva Premiership Rugby star Billy Vunipola.
But there were defensive errors from England, with Fiji’s first-half try coming after England crumbled five metres from their own line.
And Cole believes Wales and Australia will be eager to exploit the English frailties and has called on his side to be mentally stronger next time around.
"We've got to be better mentally because we switched off in an area in which we probably can't afford to,” said Cole.
"On the next scrum we pretty much went straight through Fiji, so we put it right. It's not a physical aspect, more of a mental one.
"We have to understand that five metres out is an area Fiji would go for us and Wales and Australia will now be licking their lips.
"We understand we've got to be better and realise that we can't give opportunities like that to teams.
"Australia and Wales will look at that and believe they can get a result at our set piece and will go at us hard there. There will be work done. It's still a work in progress, but we understand it's got to be a quick one."
The England scrum has come under scrutiny in the wake of their victory but Cole has leapt to the defence of fellow Leicester Tiger Tom Youngs and believes their exploits in the Aviva Premiership can be invaluable to England.
"I prefer Youngs. I think we work well together at the club. Yes, he's shorter and might have a bit less ballast, but technically he's very good," said Cole.
"Because he was converted from centre, he didn't have any bad habits. He worked hard with Mefin Davies and George Chuter at Leicester.
"He's one of the most powerful guys in the squad. Tom Youngs all the way."