Frenkie de Jong has revealed he spoke to both Paris Saint-Germain and Manchester City before deciding to sign for Barcelona.
"An important addition", he said.
De Jong has a five-year deal with Barcelona that will keep him there through the 2023-24 season.
Netherlands worldwide De Jong can also play in defence.
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Barcelona calls De Jong "one of Europe's most promising midfield talents".
"The cost of the transfer operation is €75m, plus a further €11m in variables".
De Jong, who is already a Netherlands global, has signed a five-year deal with LaLiga champions.
Dutch coach Aad de Mos has claimed that Barcelona captain Lionel Messi was desperate for the club to sign Ajax midfielder Frenkie de Jong.
The now, former Ajax put pen to paper on his Barça deal in the company of club president Josep María Bartomeu and CEO Òscar Grau this evening in Amsterdam.
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De Jong's rapidly rising status belies the fact he has made just 65 appearances for the first team.
De Jong is the third signing by Barcelona in the winter transfer window, along with forward Kevin-Prince Boateng and defender Jeison Murillo. I am proud of the lengths that they went to.
Meanwhile, they will also face Real Madrid in the Champions League round of 16.
And indeed later on Tuesday, Barcelona received information that De Jong wanted to join them.
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