FC Barcelona has agreed to sell a 10 per cent stake in its media rights to US investment group Sixth Street, in a deal that will deliver more than €200mn to shore up the Spanish football club’s troubled finances. The deal, announced on Thursday, will hand Sixth Street a slice of the Catalan club’s media rights for a 25-year period. The club may consider selling another 15 per cent stake later this summer, according to people familiar with the matter, which could allow Sixth Street to increase its share further.