The final test at the Oval in London begins on Thursday.
At one stage, Australia's star batsman Steve Smith was seen wearing and rubbing a pair of glasses before shadow batting left-handed in the middle of a team huddle.
Leach was an unlikely hero in the third Test at Headingley when he came in at number 11 and helped centurion Ben Stokes chase 359 to win.
Langer has insisted Smith was actually making a joke at the expense of Chris Rogers, the former Australia opener who played on the 2015 Ashes tour and is close to several members of this side.
"Chris Rogers is a great mate of the squad, that's what it was about". People can make of it what they like. People can make of it what they like, we can't do anything about what people make of it.
"I know he's got some strong goals for this series, and moving forward", Langer said. That's OK, that's life.
Paine said: "Steve is the best player I have ever seen". People can make of it what they like.
'That celebration was two out of 10 to some of the ones I have seen because we knew we had to play three days later, ' he said.
"He's been great, good for the crowds, good amongst the group. They know there is still unfinished business and we are looking forward to this last Test match".
Smith is banned from leadership roles until March because of his involvement in a Cape Town ball-tampering scandal past year but he is tipped by some former players and leading cricket writers to regain the captaincy from wicketkeeper Paine after his batting heroics in England.
"Fake news, like Donald Trump says", said Bayliss.
Australia have an insurmountable 2-1 lead in the series, retaining the Ashes, and will look to win the rubber in England for the first time since 2001. "He hasn't got the runs he wants at the moment but jeez I'm looking forward to seeing it when he does, and there's no better place in the world to bat than The Oval".
"We've got the best fast bowler in the world (Pat Cummins) and the best Test batsman in the world", he told Sky Sports. He has been tormented by Stuart Broad in particular, but Australia coach Justin Langer has once agian thrown his weight behind the opener saying the Oval is the ideal place for Warner to hit form.