Higuain is out of contract this summer at the Italian champions and he qualifies to play for Athletic as he is the great-grandson of a Basque who emigrated to Argentina.
The 32-year-old has dual Argentine and French nationality as he was born in Brest – the team where his father played after a career at home with San Lorenzo, Boca Juniors and River Plate.
Higuain’s elder brother Federico, currently playing for MLS club Columbus Crew as a deep-lying forward, was once linked to Real Sociedad and it was at this time that the Basque-French connection came to light.
The father, Jorge, is cited as once saying: “My father always told me that he had been taught that the Basques are neither Spanish nor French, only Basques.”