Paris - FIFA said on Thursday it was investigating Brazilian superstar Neymar's complaint over an unpaid loyalty bonus from Barcelona in the increasingly bitter feud with his former club since his move to Paris Saint-Germain.
A FIFA spokesperson said the complaint was "pending and being investigated" and he could not comment any further.
Barcelona are refusing to pay a €26-million bonus to Neymar for signing a five-year contract renewal last year.
In a separate issue, the Catalan giants are seeking €8.5 million in compensation from Neymar for breach of contract following his world record €222-million move to PSG in August.
Neymar's family hit back on Tuesday with their representatives expressing their "surprise" at Barcelona's compensation claim "given that the player fully respected the contract valid at the time".