Here's a weird one.

Hall of Famer Jeff Fenech was arrested in Sydney yesterday after an altercation with his friend Peter Mitrevski where Fenech allegedly brawled with Mitrevski and knocked out a tooth and bruised the man's ribs.

Police questioned Fenech, 44, from Five Dock in Sydney's inner west, over the incident at his friend Peter Mitrevski's house at Banksia about 5pm (AEDT) on Monday.

He was released without charge pending further investigation into the row, which left Fenech needing stitches in his hand, while Mr Mitrevski had a tooth knocked out.

Fenech claims it was "just two friends having an argument'', but his mate reckons the triple world champion should face court for his thuggish behaviour.

"I think he should be charged because what he's done means he can go to any place, take a friend and smack the bloke in the mouth,'' Mr Mitrevski told the Nine Network on Tuesday.

He claims the pair hadn't been speaking for several weeks and Fenech king hit him while they were arguing.

"Then I said to him: 'Is that the best you can do?', then he hit me again, then he grabbed me by the throat, then he was choking me,'' he said.

"We've always had arguments, but we've never ever come to this. You know I've known him all my life.''

Fenech apologised to his friend via the media on Tuesday, saying it was an accident and he never meant to hurt him.

The Daily Telegraph says the fight was over "cheap diamonds."