Frenkie de Jong was key to Barcelona's board moving for Holland coach Ronald Koeman.

Barca are in talks with the Dutch federation about releasing Koeman from his contract. After axing Quique Setien on Monday evening, Barca want to install Koeman as new coach.

And local Spanish journalist Moisés Llorens revealed on FOX Sports: "If there is anyone who knows Frenkie de Jong well, it is Koeman.

"And knowing that Lionel Messi is 33 years old, Frenkie de Jong is the future of Barcelona. And so it is a great advantage to have a Dutch trainer like Koeman.

"At Barca three players are not allowed to be sold. At Barcelona everyone is for sale, even the president. But three players are absolutely not for sale: Lionel Messi, Marc-André ter Stegen and Frenkie de Jong. De Jong is not transferable."