Stuart Lancaster expects a stern test from Australia in next week's international clash at Twickenham.
The Aussies were trounced 33-6 by France on Saturday night but they will have captain David Pocock, wing Digby Ioane and prop Ben Alexander back in their ranks for the trip to London.
And Lancaster is acutely aware the Wallabies drew 18-18 with world champions New Zealand before departing for England.
"We recognise the strength of Australia," Lancaster said, whose young team dispatched Fiji 54-12.
"They pushed the All Blacks to 18-18, they are a good side. The intensity of the game and the speed of the decision-making is going to be reduced.
"We have to train at a higher intensity this week and keep putting the players under pressure so we are ready for what comes on Saturday.
"They will be very motivated coming here and we need to make sure we are ready. We have to make sure we compete and perform to our highest level next week.
"You only had to look at the players in the changing room to know they will remain grounded.
"They were quietly pleased with the performance but they were not shouting from the rooftops. We recognise the challenges ahead and we will have to up our game to win next week."