Adam Gilchrist says David Warner's "extreme" personality swings are worrying for the Australian test side.
Warner was caught being physically restrained in an altercation with South African batsman Quinton de Kock earlier this week, during a tea break in the test side's encounter.
CCTV footage was released to the media, in an action which the former Australian wicketkeeper, speaking on SEN Radio, said was "not a good look" for either side.
"Now he's come back again saying 'old Davey's back' and all his teammates are saying 'the Reverend's gone, Bull's back'.
"It's always a worry in any situation when someone is so extreme in one direction or the other.
"I think Davey's got to find somewhere in between that.
"He does pride himself in being a leader of the team, he did that very well in the T20s as captain.
"But what we've seen in the last 24 hours probably isn't the images that you want your captain projecting."
Amid allegations that de Kock may have insulted Warner's wife, Gilchrist added on Twitter, "whatever the case, going personal is absolute rubbish from anyone."