Mikel Merino has a release clause at Newcastle United.
The midfielder, signed from Borussia Dortmund last summer, has been linked with a number of clubs this summer.
And Merino is reportedly keen to join Real Sociedad, having been frustrated at a lack of first-team opportunities in the second half of last season.
Merino, 22, has a £10.5million release clause in the United deal he signed last summer, according to ESPN.
Real Betis, Sevilla and Athletic Bilbao have also been credited with an interest in Merino, who made 14 Premier League starts for Newcastle last season.
The Gazette understands that Merino does, as reported, have a release clause in his deal. However, the exact figure is unclear.
Rafa Benitez has identified potential replacements, though he can't move on targets until he agrees a transfer budget with Newcastle owner Mike Ashley, who wants his manager to sign a new deal.
Merino spoke to the Gazette about his future early last month.
The Spain Under-21 international said he would "clear his mind" in the summer aftter a frustrating few months.
Meanwhile, Gateshead have signed midfielder Jack Hunter, who was released by United this summer.
“I’m really happy to have signed at Gateshead, the possibility of playing up to 40 games a year which is what I think I need for my development at this time in my career." said the 20-year-old.
“Its a great opportunity to come and play for a great football club where I can learn valuable experience.
“I think it’s important that Steve (Watson) is building a squad of local players, you’re always going to get a bunch of players who’ll give their all.
“I think if you get a team that can gel together then they can push forward, and hopefully it’ll be a good catalyst for the upcoming season.”