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The two-time NBA champion LeBron James has signed an unprecedented lifetime endorsement deal with sportswear firm Nike.

The details haven't been made public, but its being reported as the most lucrative for an individual athlete in the companies history.

Simon Rines, editor of Sponsorship Today, tried to shed some light on exactly how much the contract would be worth to Sport Today's John Bennett and first Ade Adedoyin.

Picture: LeBron James. Credit: Getty Images