But the Catalan club’s South American representative has antagonised Gremio top brass by making the player don a Barca kit.
Arthur has shone in the continent’s equivalent of the Champions League this season making him a desirable target for European teams.
The player has £44m release clause in his contract is thought be preparing to leave Gremio after leading Copa Libertadores glory.
He was called up by Brazil coach Tite in September, but has yet to make his full international debut.
Arthur’s graceful and efficient style of play has seen him compared to Barcelona legend Andres Iniesta.