Fremantle star forward Chris Tarrant has been accused of punching a Darwin politician and baring his backside to a woman at a nightclub during the Dockers' weekend AFL trip to the Northern Territory capital.

The incident is alleged to have occurred in the early hours of Sunday morning at The Lost Ark, where Dockers had gathered after their 26-point loss to the Western Bulldogs the previous night.

In a separate incident, Fremantle said their assistant coach Mark Harvey was knocked unconscious by an unidentified man at the same venue.

Labor candidate for the Federal seat of Solomon, Damian Hale, who is also the AFL coach at the Northern Territory Institute of Sport, said on Monday he was the victim of a Tarrant hit.

"He's just punched me, gave me one and then he took off, so I didn't retaliate or anything and then we left almost straight after that," Hale told the Nine Network.

He said the Fremantle star had earlier bared his backside at a female.

"It was just offensive, I thought, in the way he basically brought down his trousers and bared his backside to her," he said.

Fremantle chief executive Cameron Schwab said the Dockers were investigating Hale's allegations.

"We have spoken to Chris in relation to this issue and advise that a full investigation will immediately take place," Schwab said.

Former Kangaroos and Adelaide player Jason McCartney, who was also at the nightclub, said he had not seen Tarrant involved in any scuffles.

But he said he convinced Tarrant to leave because he sensed trouble brewing.

"I did go up to Taz and tell him to get out of there because there was a big crowd there and a bit of angst going on," McCartney told AAP.

"I saw him, we're managed by the same guy, the last thing he needs is to get involved in something."

The alleged punch by Tarrant continues a history of the former Collingwood forward finding trouble at nightspots.

He was traded to Fremantle by the Magpies at the end of last season, a move that came months after he and team-mate Ben Johnson were involved in a nightclub brawl in July last year, with the Magpies fining them $5,000 each.

The weekend incident came in a season littered by acts of poor discipline from Dockers players.

Goalsneak Jeff Farmer is nearing the end of a club-imposed suspension for hitting a nightclub bouncer in April, while eight Dockers have been suspended by the AFL Tribunal this year for on-field incidents.

Schwab said the blow to Harvey came after a group of locals targeted Fremantle players and the assistant coach stepped in to try to settle things.

He was allegedly hit from behind by an unidentified man, with his head striking the wall or floor as he fell, knocking him out cold.

Players helped him to the team hotel, where he was examined by team doctor Ken Withers.

Schwab said Harvey had yet to decide whether to press charges, while Hale said he did not intend pressing charges against Tarrant.

Darwin police said they would investigate if any complaint was made.

Schwab said there was little more the club could do to stop players getting tangled up in off-field trouble, short of imposing a blanket ban on them attending nightclubs and hotels.

"Probably the next step, if you don't do it in the way that we did it, would be really to say let's just not (go out) at all," Schwab told Melbourne radio station SEN.

"That's an option, but in many ways it's an unrealistic option.

"You do what you can to make sure the players are as safe as they can be."

Schwab said Darwin "can be a little bit frontier country" and added that players had been given more leeway than normal because they have next weekend off.

"We do talk a lot about expectations when they do go out," he said.

"We also understand that they put themselves in a vulnerable situation by being out at that time, not just because of their own situation, but because perhaps others around them have had too much to drink or whatever, so we just do what we have to.

"But I'd hate to think that we get to the stage where we have to put a blanket ban on them."

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