The Seven Network alleged that documents tendered to court by Arthur said Clarke described former vice-captain Shane Watson as a cancerous influence on the team.
The skipper said the team were now as united as he'd ever seen under Lehmann.
"It's no coincidence Darren played a big part in that. I think him as a man, as a gentleman brings that to the forefront. He was a great guy to play with and he's no different as a coach," he said.
"Decisions have been made and made for reasons. We've got a fantastic group with a great coach who has united us and we're heading in the right direction."
The reports allege Clarke had described Watson and his faction as "a cancer", with Arthur calling himself the "meat in the sandwich" in the imbroglio.
Brad Haddin, the man who took over from Watson as vice-captain for this Ashes tour, said there was no feud between the opener and captain Clarke.
"The Australian dressing room is fine. There is no feud. I don't know how many times we need to answer that," said Haddin.
Arthur also allegedly said that Watson had tipped him off about the incident in which Australian opener Warner punched English batsman Joe Root in a bar before the series start.
Watson has previously denied that was the case.
Warner was subsequently fined and suspended and has since admitted guilt at playing a part in Arthur's termination.
Arthur went on to say in the tendered document that CA did not support him over the 'homeworkgate affair' where four players were stood down from a Test in India for failing to do an assignment.
He alleged that he was discriminated against because he was from South Africa and did not understand the Australian way.
"We're disappointed it has come to this position but Cricket Australia is confident in its position on this matter and I'm sure it will get resolved in an appropriate fashion," CA lawyer Dean Kino told Seven.
Clarke said he didn't want to trudge over old ground but is confident the drama won't affect team preparations.
"The timing makes no difference to me. It doesn't bother me whatsoever," he said.
"My eyes are focused on one goal and that's on winning this Test match. And I know everyone in that change room is exactly the same."
Australian Cricketers Association chief executive Paul Marsh said he sympathised with Arthur's situation, but is disappointed with the timing of the allegations becoming public.
"At Mickey's departing press conference he talked about taking responsibility for the team's performances and leaving the job with dignity," Marsh said in a statement.
"I fail to see how this course of action is consistent with his words."
- AAP
