Australia will need all their experience and character for a "tough and painful" encounter with Scotland in a World Cup quarter-final on Sunday (23:00 HKT), says coach Michael Cheika. Cheika's side will be seeking a third successive top-notch performance at hosts England's headquarters where they have shown their armoury to two different sides. "It's a match that's going to be tough and painful, physical and difficult," said Cheika, who nevertheless has a side packed with experience, including two new test centurions in centre Matt Giteau and captain Stephen Moore. There’s going to be a lot of pain, it’s going to be physical and I want the players to enjoy that as well because that’s when it’s worth it Michael Cheika, Australia coach Two weeks ago, with fly-half Bernard Foley orchestrating the Wallabies' rapier offence, Australia cut the English to ribbons in a 33-13 victory. A week later they produced a remarkable backs-to-the-wall defensive display to repel a Welsh onslaught, despite being two men down for nearly 10 minutes, and run out 15-6 winners. Now the Wallabies - who will be without two influential injured players in fullback Israel Folau and number eight David Pocock - must confront a Scotland side who are improving fast under Kiwi coach Vern Cotter. "There's going to be a lot of moments when we are going to be under pressure and that character is what's required at that time to help you," said Wallabies coach Cheika. READ ALL OUR RUGBY WORLD CUP COVERAGE HERE... "Our goal is to improve on our performance against Wales. There's a lot of areas where we can." Cheika said the Scots would represent the toughest challenge yet. "One hundred per cent yes, this will be the most difficult game we play and that's not disrespecting our other opponents at all because every match has been tough, but this will be the toughest," the 48-year-old said. "There's going to be a lot of pain, it's going to be physical and I want the players to enjoy that as well because that's when it's worth it." For the first time in three games Cheika's side have been cast in the role of solid favourites. But Cheika rejects the top-dog tag. "We don't think we are complacent. Nobody was saying that about us [being favourites] many months ago and things aren't any different now," he said. "We're acutely aware that this is really important for our own journey as a team. I've seen a lot of the Scottish players saying they can win - and they can, they can. "It's the reality of sport and what we need to make sure is that our mindset is really clear on what we're prepared to do to get that victory." Wing Adam Ashley-Cooper, who will become the third most capped Wallaby with 112 appearances, says the Scots can't be taken for granted. Meanwhile, Scotland forwards Ross Ford and Jonny Gray were cleared to play in the quarter-final after winning appeals against suspension for foul play. Both had been banned for three weeks for dangerous tackles in a pool game against Samoa. The appeals committee dismissed earlier findings that the players had "intentionally" committed dangerous tackles because the opposing player had "not been dropped or driven".