Andy Farrell is wary of a wounded Australian side following the British and Irish Lions' 27-19 win in Brisbane on Saturday.
The tourists dominated much of the match, particularly the first half, with the Wallabies scoring two late tries to bring the score closer.
Particularly with his starting XV on the pitch as Jamison Gibson-Park and Finn Russell steered the ship, the Lions were in control.
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However, with the series on the line, Farrell is aware that Australia will throw everything at them and improve in Melbourne in a week's time.
"Not only is that Australia's second game [of the season] and they'll be much better because of that but because of what it means to them and how proud they are, it will mean the world to them," Farrell told his post-match news conference.
"We need to make sure that we're ready for them being 100% at their best.
"I suppose it will take a better performance from what we've shown today to make sure that we get a W next week as well
"As far as the Wallabies are concerned, Australia are right up there, never mind the history, but going forward as well.
"What's going to happen over here in the next couple of years; I can only see Australia going through the roof as far as that's concerned."
Farrell also warned his own side they can't afford to drop off as they did later in the match again.
"Well that shouldn't happen," he said.
"That shouldn't happen and we talk about that. We talk about being next moment focused the whole time and that certainly shouldn't happen.
"We certainly need to address that as well."