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Mark O'Connor or Brandan Parfitt will likely be called into Geelong's team for the AFL grand final, with Max Holmes expected to be ruled out.

The big decision was reportedly made on Friday afternoon, despite Holmes moving well during a fitness test on his injured hamstring that morning.

The 20-year-old wingman, who suffered the injury during the preliminary final against Brisbane, did not take part in the Cats' light training run at the MCG on Friday afternoon.

He spoke to club staff on the boundary line as his teammates completed light work ahead of Saturday's season decider against Sydney.

Irishman O'Connor has been the medi-sub in the Cats' two previous finals and appears the most likely replacement if Holmes is ruled out.

Parfitt and Sam Menegola are also in the mix, named with O'Connor as emergencies alongside back-up ruckman Jon Ceglar.

On Friday, Geelong coach Chris Scott said O'Connor was "probably" the man to come in if Holmes was ruled out.

That would leave Parfitt or Menegola as the likely medi-sub.

"There are three guys over the last couple of weeks in our squad, in particular, that have been desperately unlucky," Scott said.

"Mark's been one of them, Sam Menegola is another and Brandan Parfitt is probably the other.

"There's another group of players beyond them but if you had have asked me 12 weeks ago, I would've said that those three guys are in our team for sure.

"I feel desperately for them but if Max doesn't come up it will be one of those guys that comes in."

Sydney have also had injury concerns during the week, but coach John Longmire insists Sam Reid (adductor) and Justin McInerney (ankle) will play.

Reid was substituted out of the preliminary final win over Collingwood but McInerney managed to finish the game.

"(Reid) got some scans on Monday and that was really encouraging, so we were confident from that point," Longmire said.

"He did some training on Thursday and did exactly what he needed to do.

"Our medical staff have been terrific, we were always confident that (McInerney) would be right.

"He finished off the game strongly last week so he's right to go."

© AAP 2022

Naked selfies shared by teenagers are being weaponised by online predators and contributing to an increase in child exploitation material linked to self-produced content.

As more children acquire smartphones earlier, predators have increased opportunities to access those "sexts" indirectly online, or manipulate and extort children into producing sexualised content, experts warn.

Australian Federal Police child exploitation investigator Constable Tom Clayworth has linked a rise in self-produced content to a third consecutive year of record-breaking reports to the Australian Centre to Counter Child Exploitation.

When children come up against these adults, who are often technologically sophisticated and manipulative, they are vulnerable and exposed, Const Clayworth said.

"These offenders are very, very good at masquerading as something that they're not," he said.

University of the Sunshine Coast senior criminology and justice lecturer Dr Lara Christensen believes that despite years of warnings about the dangers of sexting, many teenagers are still none the wiser.

She points to Australian Institute of Criminology data dating from 2015 that showed 38 per cent of children between the ages of 13 and 15 had sent a sexual picture or video or another person. Additionally, 62 per cent had received a sexual picture or video.

"One could simply hypothesise, unfortunately, what this data might look like now (since COVID-19)," Dr Christensen said.

Those photos and videos "can very well end up in somebody else's hands on some online platform, contributing to that big increase in child sexual abuse material reports," she added.

"The child may have thought they were doing something harmless during COVID-19 ... (and that) has now become extremely harmful."

Most teenagers also wouldn't be aware saving a naked photo of themselves was considered possession of child sexual abuse material, which is a crime, Dr Christensen said.

University of Melbourne senior research fellow Dr Gemma McKibbin warns the ability of children to access free pornography online essentially "grooms" them, so when they encounter predators and are instructed to engage in sexual acts, "in a way, they know what to do".

The experts are calling for parents and carers to have discussions with children about the dangers of sexting, after online child abuse reports rose by more than 60 per cent to 36,600 in the past 2021/22 financial year.

Const Clayworth warns that no site is off-limits for child predators, even on online games. Predators may offer to buy victims in-game items in exchange for child abuse material.

"(Parents and carers are) the first line of protection for children," Const Clayworth said.

"It's really important for parents to teach their kids about online safety and have an understanding and conversation about what they're doing online, and (that) kids can come and speak to them if ... someone's asked them for something online."

All children should have the right to use online apps and games and keep in contact with their friends, without the fear of sexual abuse, Const Clayworth said.

Lifeline 13 11 14

Kids Helpline 1800 55 1800 (for people aged 5 to 25)

© AAP 2022

Roger Federer was unable to bring the curtain down on his illustrious career with one final victory after he suffered defeat in the doubles at the Laver Cup to ensure a dramatic opening day ended level at 2-2.

The 20-time grand-slam champion teamed up with old-rival Rafael Nadal for his 'last dance' in London but saw his dream finale ruined by Jack Sock and Frances Tiafoe, who won 4-6 7-6 (7-2) 11-9 to dampen spirits at the O2.

Spectators inside the venue had been stunned earlier in the day when a protester ran onto the court and set fire to his arm in a protest against private jets being used in the UK.

It was a distant memory by the time Federer had started to roll back the years but he could not maintain a strong start with Team World able to level up the scores after Team Europe had opened up a 2-0 lead at the start of the day.

This Ryder Cup-style team competition was the brainchild of the Swiss star and first started in 2017 with a format which sees six of the best players from Europe take on six counterparts from the rest of the world across a mixture of singles' and doubles' contests over three days.

Federer had to bend his own rules to feature in only a doubles contest due to his troublesome knee injury but produced several highlights in two hours and 14 minutes of action before he bowed out from competitive tennis following a lengthy hug with old adversary Nadal and another standing ovation.

A marathon two-hour-and-29-minute clash between Andy Murray and Alex de Minaur kicked off the evening session with the Team World player winning 5-7 6-3 10-7 to get the visitors on the board.

Double Wimbledon champion Murray had displayed plenty of his trademark defence during a lengthy battle but it was the Australian who held his nerve in the 10-point tie-breaker.

"I just wanted to do anything I could to get the win for my team and I managed to find a way," de Minaur said on-court.

"I don't know how much tactics were out there. It was be ready for a battle and for however long it took. Andy is a hell of a player, he has done so much for the sport and it is just great to have him around."

A protester had grabbed the headlines during the afternoon session when he set fire to his arm in an act to highlight the climate issues surrounding private jets being used in the UK.

It was during a changeover between sets in Stefanos Tsitsipas' 6-2 6-1 win over Diego Schwartzman that the spectator raced onto the black court and briefly had his arm ablaze before security were able to step in.

Tsitsipas admitted: "It came out of nowhere. I have no idea what this is all about. I never had an incident like this happen on court. I hope he is all right."

Victory for Tsitsipas followed up Casper Ruud's thrilling 6-4 5-7 10-7 success over Sock at the beginning of day one .

Ruud received in-game coaching from his Team Europe colleagues, notably Nadal, and said: "Obviously I was focused about the match and trying to win it but it is fun, you turn around and have Rafa on one side and Roger on the other trying to help."

© PAA 2022