The tourists currently lead the series 1-0 after a dramatic 23-21 victory over the men in gold in Brisbane last weekend.
Despite being in front, the Wales international has warned his side that the Wallabies will be dangerous as they look to bounce back, but is confident that the Lions can win the tour this weekend.
"We know they will bounce back. They were only a kick away from winning last week so they know they have every chance of getting the Test series back," Warburton told the official Lions website. "If it was 1-0 down, the talk in our camp would be that we believed we could bring it back. The Australians being Australians, they are great competitors and there is no way they will be down and out.
"I imagine they will come out firing. As Warren said it is all or nothing for them now and we expect a huge performance from them. All the talk around the players this week has been about making sure we finish it this weekend. There has been no complacency, thinking that we've got a week off because there is another opportunity next week.
"Momentum would completely swing if Australia won. They'd be going into another home game to finish after winning a game, so we definitely want to finish it off this weekend and the players are motivated to do that."
The Lions meet Australia in the second match of the three-Test series on Saturday.