The Aussies have not claimed a series win since their 5-0 whitewash victory on home turf back in 2006-07 and go into the current tour as being expected to lose.
While he admits that the Test matches will be tough, Clarke feels that Australia have what it takes to upset England.
"We come here as underdogs and we know it's going to be tough but I know the boys are up for the challenge," said Clarke. "I think every single one of our boys has prepared as well as they possibly can. Now it's about going out on that stage and playing with freedom and backing your own ability.
"We have so much talent inside that room and I just want to see the guys play their natural games.
"We've spoken about a lot but I think the talking is done for us as a team now. Now it's not what you say, it's what you do."
The first Test gets underway from Trent Bridge at 11am.