Giannis Antetokounmpo rejected an Adidas endorsement offer in 2013 because the company would not include his brother Thanasis in the contract. He signed with Nike instead. The decision, disclosed recently, came before either brother had been drafted into the NBA.
Adidas wanted only Giannis. He wanted both brothers or nothing. Thanasis was playing professionally in Greece at the time. Giannis told the brand his brother was the better player and deserved representation. Adidas declined. The family moved to Nike, which structured a deal covering both. Thanasis entered the 2014 draft as the 51st pick by the Knicks. Giannis went 15th overall in 2013 to Milwaukee. The Nike relationship has since generated an estimated $9 million annually for Giannis in direct payments, plus signature-shoe royalties that industry sources peg in the low-eight figures since the Zoom Freak line launched in 2019.
The refusal matters because it exposes a structural blind spot in how sportswear companies evaluate pre-draft talent when family dynamics enter term sheets. Adidas was buying potential in a 6-foot-9 teenager from Athens with no college tape. The ask was not expensive—Thanasis would have cost perhaps $50,000 annually in a minor apparel deal, a rounding error against even a modest rookie endorsement. But the brand's talent team separated the brothers into distinct risk profiles, treating Giannis as the investment and Thanasis as dilution. Nike's willingness to bundle both created ten years of loyalty with a player who has since won two MVPs, a championship, and become the franchise anchor for a team worth $2.3 billion. The cost of that loyalty was agreeing to pay a second brother who has appeared in 202 career games over six seasons, mostly as a roster-minimum depth piece in Milwaukee.
The structure also reveals how sibling leverage works differently in basketball than in other sports. In football, brothers rarely share representation or endorsement timing because positional variance and draft classes scatter them. In basketball, the small-roster format and international pipelines let families negotiate as units. LiAngelo Ball, LaMelo Ball, and Lonzo Ball forced a similar dynamic with multiple shoe companies before splitting across brands. The Antetokounmpo family now includes four brothers with professional contracts—Giannis, Thanasis, Kostas (won a ring with the Lakers in 2020), and Alex (still overseas). The Nike deal covers at least two. The exact terms remain private, but league sources say the initial family package ran three years with options tied to Giannis's NBA performance, not Thanasis's.
Adidas has since reframed its approach to international talent. The brand signed Donovan Mitchell and Trae Young to extensions in 2023 with contract language that allows for family member appearances in marketing activations and training content, though not guaranteed separate endorsement deals. One brand executive, speaking on background, said the shift came after analytics showed that athletes who brought siblings into negotiations stayed with brands 26% longer on average than solo signees, even controlling for on-court success. The data did not specify whether the family members themselves drove retention or simply correlated with players who valued non-financial terms.
Nike's basketball division now treats sibling clauses as standard optionality in deals with international players under 21 years old. The company does not automatically sign the family members but includes right-of-first-refusal language if another brand makes an offer. This costs Nike nothing unless a sibling develops independent value, at which point the company already has exclusivity. Adidas does not include similar language in its template international contracts, according to two agents who have negotiated both.
Giannis's current Nike deal runs through 2026 with a player option for 2027. His signature line generated an estimated $175 million in retail sales in 2023, ranking sixth among active NBA players. Thanasis remains on the Bucks roster at $2.02 million guaranteed for the 2024-25 season. His Nike arrangement is understood to be a separate minor deal worth low-six figures annually, structured after Giannis's 2017 extension rather than in the original 2013 contract.
The Adidas decision cost the brand not only Giannis but also the upstream credibility with Greek federations and youth programs where the Antetokounmpo family maintains deep ties. Nike has since signed three additional Greek prospects to entry-level deals, none of whom have reached the NBA. The investment is not about those players. It is about the next family from Athens that walks into a negotiation with two brothers and one ask.
Watch Giannis's 2026 extension talks. If he stays with Nike, the family clause becomes a case study. If he moves, someone learned that $50,000 in 2013 would have been cheaper than whatever the bidding starts at now.
The takeaway
Adidas lost Giannis and **$175M** in annual shoe revenue by refusing a low-six-figure sibling clause in 2013.
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