Image: Supplied.

Jack Miller has raised $18,000 for the New South Wales Rural Fire Service after auctioning his helmet from the 2018 MotoGP World Championship, joining a list of Australian athletes raising funds in an effort to aid the fire crisis in the country.

Bushfires in Australia have claimed as many as 24 lives and burned 6.3 million hectares of land, while also killing millions of wildlife – particularly in the most affected areas of New South Wales and Victoria.

Having received 22 bids, the helmet eventually sold for $18,000 after bidding concluded at the weekend – the one-time MotoGP race winner has promised to sign the helmet and ship it out to the recipient.

The 24-year old joined other local sporting stars in raising money for the cause after cricketing legend Shane Warne and current Formula1 driver Daniel Ricciardo also made sizeable donations.