As Visa U.S.A. looks ahead to the fifth year of its National Football League sponsorship, the future of the marquee alliance is up in the air.

Last week, when Visa unveiled its marketing campaign for the fall season, the last under its current contract, it would not say whether it planned to renew the deal. The NFL's popularity may make this the most coveted U.S. sports sponsorship, and Visa executives say the affiliation has boosted their brand.

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