Kyerin Grundy has been left shattered after being denied the top prize for winning AFL Fantasy.

Grundy defeated more than 150,000 registered teams to score the most points across the gruelling season.

WATCH THE VIDEO ABOVE: Grundy brother denied $70,000 fantasy prize.

The major prize for the overall winner is a Toyota Hilux valued at up to $70,000.

There are also cash prizes for the rest of the top 10, while the entire top 100 are awarded a coveted hat with their finishing position printed on it.

But Grundy has been told he is not eligible to win anything. And that is because he is the brother of Sydney superstar Brodie Grundy.

The official rules say: “Entry is open to all people; although employees of the promoter, the AFL, all AFL clubs and other agencies, firms or companies associated with this promotion, and their immediate families will not be eligible for prizes. Non-Australian entrants will not be eligible for prizes.”

The official rules don’t specify exactly what immediate family is. In another competition on the AFL’s website — an Auskick competition — they do specifically explain what immediate family is.

“Employees (and their immediate families) of the promoter, participating outlets and the agencies associated with this promotion are ineligible to enter this competition. Immediate family means any of the following: spouse, ex-spouse child or step-child (whether natural or by adoption), parent, step-parent,” the terms and conditions say.

The AFL Fantasy competition requires you to pick a team with a salary cap at the start of the season and make trades throughout as players’ prices fluctuate based on form.

But it must be said that being related to an AFL player doesn’t really give you an advantage over everyone else.

Grundy’s brother, Brodie, has been one of the game’s best players throughout his career and would have featured in nearly every team by the end of this season.

And winning the overall competition requires a considerable amount of good decisions around trading and captain choices, as well as luck with injuries, along the way.

Interestingly, Kyerin joined the AFL Fantasy’s official podcast earlier this month to discuss his season to date and his chances of winning the overall prize.

He also revealed he only brought his brother into his team quite late in the season, as the Swans ruck enjoyed a brilliant finish to the year.

Grundy’s appearance on the podcast, and being the brother of Brodie, was trumpeted on the AFL’s platforms and the podcast hosts, The Traders, appeared to have no idea about the eligibility rules.

“Hopefully we can all go for a ride in the Hilux,” host Warnie said during the interview.

There was also an article written about Grundy and his chances of winning that was published on the AFL’s website before it was deleted.

Given Grundy’s family situation was well known in AFL Fantasy circles after that podcast appearance earlier this month, it came as a surprise to him that no one contacted him about the eligibility rules until after he had finished first.

It wasn’t until Monday morning, the day after the Fantasy season ended, that Grundy was told he was ineligible for the top prize.

Grundy thought that because he was on the podcast and no one said anything about the rules at the time, then it wouldn’t have been an issue if he won a major prize.

“They would have known I was going to win a prize of some sort and then no one said anything until the Monday (which) was disappointing,” Grundy told 7NEWS.com.au.

“I think it went to their legal team and they’ve then decided that under the immediate family rule, that I’m not eligible for the prizes, and that also, they were unaware of me being on The Traders podcast, and they took it down as soon as they realised.

“So they’ve just sort of totally just blown it off.

“I don’t even know if they’re going to still recognise me as the overall winner or if someone else is the overall winner.”

After the phone call on Monday, Grundy wasn’t contacted again until Thursday when he received a standard email explaining he wasn’t eligible.

Grundy said he understood the eligibility rules, but hoped there might have been some acknowledgement of his season.

“I was hopeful that they might do some sort of goodwill gesture or you know something, but it just seems as though it’s all just been left in the lurch with it all,” he said.

“There wasn’t even on the email something like, ‘we still want to really celebrate the fact that you’re the overall winner, but unfortunately, you can’t get a prize’.

“It’s like, I’ve just been totally shunned and they want to wipe me from the record books.”

The official accounts haven’t yet announced the overall winner and it’s unclear what the promoters of the competition will do with the prizes now that Grundy has been ruled ineligible.

An AFL spokesperson said the prize eligibility rules are stated in the terms and conditions.