England captain Alastair Cook has promised his side will not be complacent as they look to wrap up an Ashes series victory at Old Trafford.
Cook's side hold a 2-0 lead going into Thursday's game in Manchester and require just a draw to retain the famous Urn.
But speaking after training, which saw Kevin Pietersen take part during an indoor nets session, Cook insisted their opponents still pose a threat.
"We have an opportunity to (seal the series win) but I wouldn't call it a comfort zone," he said.
"In those two Tests we have had to work hard and it won't change in this match.
"We know how hard it is to get a Test match win and we have put ourselves in a good position but that counts for nothing going into tomorrow's play.
"One of the strengths we have as a side is trying to break it down to one hour at a time and not looking too far ahead.
"We will try to get that first hour right, whether we bowl or bat."
David Warner is expected to play for the tourists having found some form with the Australia 'A' team in Zimbabwe and South Africa, following his indiscretions in a Birmingham bar during the Champions Trophy.
And Cook is determined not to underestimate Australia, who will be fighting to keep the series alive, regardless of what side they put out.
"They are a dangerous side, Trent Bridge was an incredibly close game," he added.
"Lord's was a big won but it has been a very tough series.
"The Ashes is different to any other series you play and we are expecting a very tough battle, no matter what XI we play against."
What will be the result at Old Trafford?