Barcelona are to sue former player Neymar over his 222m euro (£200m) world record move to Paris St-Germain (PSG), BBC reports.
The Brazilian made the move to the French club after they met his buyout clause earlier this month.
Barcelona are claiming breach of contract over a bonus payment triggered when Neymar signed a new five-year contract with them in October 2016.
The Spanish club say they are seeking “8.5m euros (£7.8m) in damages, and an additional 10% in interest”.
This comes about 24 hours after Neymar criticised Barcelona directors.
At the weekend, Neymar, speaking after scoring twice on his home debut for PSG in a 6-2 win over Toulouse, reviewed his days at Barca, saying: “I spent four beautiful years there and parted happy, but with them [the board], no”
He said: “For me, they are not the people who should be there, for the direction of Barca. Barca deserve much better.”
“I cannot speak now I am in another team,” added Neymar.
“I don’t know what’s going on there, but I see my old team-mates sad, and it’s that which makes me sad because I have a lot of friends there.
“I hope that things will improve for Barca and that they will become a team that can rival others.”