HARRISON Petty is having more tests this week as Melbourne tries to find out what caused his worrying health episode during Sunday's win.

While he has gone into concussions protocols, it remains unclear why the Demons defender suddenly became unsteady on his feet and had to be helped from the MCG during the Brisbane clash.

"It's a unique situation. We're still doing some tests with him," coach Steven King said before Wednesday training.

"We're still not really sure exactly what's happened – we're exploring all those possibilities.

"We've put him in protocols at the moment, because that's the most obvious, but we're still not 100 per cent sure that's the case.

"There's still a range of things it could be."

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Teammates rushed to support Petty, three days after the worrying circumstances around Carlton player Elijah Hollands.

As Carlton reviews the Hollands matter, there is talk of a mental health-themed game potentially involving the Demons and the Blues.

"After the week we've had, as an industry it's important we make moves to support and put the right things in place around people," King said.

Petty's mystery health problem means there will be at least one change for the annual Anzac Day Eve match against Richmond at the MCG.

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King expects selection will be tough, given the occasion.

"I don't think there will be too many players putting their hand up, saying 'I want to miss this one'," he said.

The Demons are coming off an impressive win that left them 4-2, while the Tigers are winless. King said he heard off-season predictions that had his team would be in that sort of hole.

"Over summer, people were saying we were going to be 0-6. I didn't see that, from the way we were training," he said.

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King added the experience of beating the reigning premier last weekend would be invaluable for his young team.

"Some of those young players ... it would be worth 10 or 15 games worth of experience, just playing against that quality of team and players, in that type of game," he said.

While they will start hot favourites against Richmond, King was at pains to note his team is far from the finished product.

"Some of our decisions and ball use – we probably handed them (the Lions) five blatant turnover goals, which is nothing about taking game on or playing with flair," he said.

Steven King is seen during Melbourne's clash against Brisbane in round six, 2026. Picture: AFL Photos

"It's a little about execution."

Second-year player Harvey Langford has been a standout so far and King said that is a reward for the extra work he is doing with assistant coach Nathan Jones.

"Footy is a pretty complex game, but it's pretty simple as well – the harder you work, the luckier you get," King said.

"Footy karma doesn't always look out for you, but he's certainly invested more time into his week. He's been getting rewarded on weekends, which is great."