In FIBA competitions lasting fifteen days or less, who can set more restrictive regulations on player nationality?

In FIBA competitions that span fifteen days or less, the governing body of the competition holds the authority to impose more restrictive regulations regarding player nationality. This is rooted in FIBA's structure and the need for a cohesive framework governing international competitions. The governing body ensures that all teams adhere to the same set of standards and regulations, promoting fairness and consistency across the tournament.

While individual teams, FIBA Zones, and national federations play significant roles in the broader context of basketball regulations, it is the governing body of the competition that has the power to enforce specific rules tailored to the unique context of any tournament. This power includes defining eligibility criteria based on national representation, which is especially crucial in ensuring the integrity of international play and competitive balance among participating teams.