It comes as detectives probe his criminal background as they hunt for the killers. But, so far no suspects have been named as triggermen in the underworld execution.

A large police presence is expected at the event after NSW Police last week assured the public they would remain on high alert for retaliation attacks.

However, criminology professor Mark Lauchs said that if some kind of attack was carried out at Hawi’s funeral, it would be a “massive bikie faux pas” which has never been committed in Australian gang history.

“I’m sure there will be a large police presence at the funeral,” the Queensland University of Technology professor told news.com.au.

“But normally other clubs come to the funeral, especially if it is a senior member and he was National President (of the Comanchero), so I would be utterly surprised if anything happened.

“It would be a massive bikie faux pas and extremely poor form.”

It is understood a service will be held for Hawi at the Al-Zahra mosque in Arncliffe on Thursday before his body is laid to rest in the Muslim section of Rookwood Cemetery.

Mr Lauchs said it is not clear whether the funeral will be a “bikie funeral” — which involves a special procession with hundreds of motorbikes and various clubs coming together to pay respects.

Born in Beirut in the Lebanon, Mahmoud “Mick” Hawi moved to Australia with his parents, brother and three sisters as a young boy in 1985.

He rose to prominence for his role in the infamous bikie brawl at Sydney Airport in 2009 while he was the national president of the Comanchero. Passengers in the terminal watched on in fear as the club clashed with rival Hells Angels members. Associate Anthony Zervas was bludgeoned to death with a bollard.

Hawi did time in prison for his role in the killing and, since his release in 2015, laid low in south Sydney.

But Hawi’s suburban life came to an end last Thursday when he was shot multiple times while he sat in his luxury Mercedes 4WD outside Rockdale’s Fitness First. He died in St George Hospital that night, aged 37.

Tributes flowed online from club members and family friends while rumours swirled about bad blood between Hawi and the current club leadership.