La Liga rules dictate teams can only have three non-EU players in their squad.
Barcelona already had Brazilian’s Paulinho and Philippe Coutinho among their ranks.
And their final non-EU spot has been taken by Mina, who’s joining from Palmeiras.
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Gremio star Arthur impressed against Real Madrid at the Club World Cup
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For Arthur to join, Paulinho, Coutinho or Mina must gain EU citizenship or leave Barcelona.
Barcelona could strengthen Valverde’s side with a couple of European stars this summer though.
Leon Goretzka and Mesut Ozil have been linked with free transfers to the Nou Camp to play with Messi and co.