La Razon says Estupian's form on-loan with Osasuna has impressed Barca scouts this season.
Indeed, the Catalans see the defender as a better option than Junior Firpo at left-back, with plans to move on the latter this summer.
It's suggested Barca would seek to buy Estupinan before loaning him to Real Valladolid for next season to maintain his development.
He would then be brought back to Barca to eventually succeed Jordi Alba as the club's prime left-back.
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