The 18-year-old winger has been linked with the likes of Tottenham, Arsenal and Manchester United in recent weeks.
The youngster has a €20million buyout clause in his contract and Real Betis will not sell him for anything less.
Stosic said: “I’ve heard no offers for Vadillo. I want him with us. Unless someone comes and pays the clause or something that is very close to the clause, he will stay.”