Promoter Eddie Hearn has made Deontay Wilder a final take it of leave it offer worth $12.5million (£8.8m) to fight Anthony Joshua for the undisputed heavyweight title, according to sources in the United States.

The Bronze Bomber holds the WBC title, while AJ unified the division last month vs Joseph Parker and holds the WBA Super, WBO and IBF titles.

The sum would represent a career-high payday for the Alabaman, whose biggest purse to date was $2.1m (£1.5m) against Luis Ortiz in his last fight.

Hearn made the latest £8.8m offer today, according to American journalist Adam Abramowitz, though that offer is potentially well below the 40 percent Wilder has publicly admitted he would accept.

The offer was "not considered seriously" with talks still active, but a deal not close.

The fight could generate up to $100m (£71m), the report adds, making the latest offer well below the 60-40 split Wilder craves.

(Image: Getty Images Europe)

(Image: PA Wire)

The demand for Joshua vs Wilder would see the fight sold on pay-per-view both sides of the Atlantic.

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Joshua's highest payday yet was also in his last bout vs Parker, with reports suggesting he pocketed £18m after selling out the Principality Stadium.

(Image: AFP)

(Image: Getty)

If negotiations fail to progress, AJ may turn to satisfying his mandatory demands with Russian Alexander Povetkin - who knocked out David Price on the undercard of Joshua vs Parker.

The Brit has been given 30 days to negotiate a deal to fight the WBA's No.1 contender before purse bids will be called.