Barcelona have told Paris St-Germain they must pay a world record 222m euro (£198m) fee “in full” before Neymar can join them.
The Brazil international arrived at training on Wednesday with his father and representative, and told the Spanish club he wanted to leave.
He was then given permission by Barca manager Ernesto Valverde not to train and to “sort out his future”.
PSG are understood to be ready to pay the 25-year-old’s release clause.
Neymar moved to Barcelona from Brazilian club Santos in 2013 for £48.6m, and signed a new five-year deal with the 24-time Spanish champions in 2016.