The Catalans made the Tottenham flop their first signing since netting a £198million windfall from Paris Saint-Germain.
Fans were underwhelmed at best by the £36.5m capture but Neymar took to Instagram to congratulate his fellow Brazilian, according to the Sun.
Alongside a picture of the two of them, he wrote “Brother, all the fortunes of the world for you … I hope you are as happy as I was.”
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Paulinho is set to be unveiled on Thursday – a day after the return leg of the Super Cup.
Real Madrid hold a 3-1 advantage from the Nou Camp as Barca struggled in Neymar’s absence but will be without Cristiano Ronaldo after his five-match ban.
Barcelona are set to continue spending after Gerard Deulofeu took Neymar’s spot for the defeat against their bitter rivals.
They are chasing a £90m deal for Dortmund flier Ousmane Dembele, while Philippe Coutinho is another top target.
