The new agreement, which begins next season and runs until the end of 2016/17, will see Adidas replace Astore as the La Liga side’s exclusive kit supplier. Financial terms were not disclosed.
“This is an honour for us because we have linked up with a historic club,” said Luis Cano, the director of sponsorships at Adidas Spain.
“I am convinced that the agreement will be very beneficial to both parties.
"It is an agreement, for the moment, for four years, but Adidas believes in long-term relationships and therefore if it is a beneficial relationship it will continue for many years.”
Osasuna’s marketing director Miguel Bados added: “I want to emphasise that we have found a brand that really has a strong commitment to the club. From the start, it has been about actions and not just words. Today is the beginning of a major commercial collaboration.”