Giannis Antetokounmpo's current Nike deal expires in September, which will make him the best available free agents in terms of shoe endorsements.

Kristaps Porzingis agreed upon a seven-year deal worth $5 million annually with Adidas last summer, which will likely set the starting for negotiations on offers for Antetokounmpo.

"The bar was set with Porzingis, in terms of financials," says one brand source. 

Antetokounmpo could sign a deal worth as much as $7 million-$10 million per year.

"I've always said that I think he's one of those guys that has the potential to transcend his market," his agent Alex Saratsis tells ESPN. "I think he's showing that he can do that. I think he's one of the few players that could have a truly global appeal."

Antetokounmpo will be looking for a signature shoe as part of his new deal.