The statement by the Ligue 1 champions is the latest in a tumultuous summer for the Brazil star.
Paris Saint-Germain have vowed to take action after Neymar failed to report to pre-season training, the club have announced.
A PSG statement read:
“This Monday, July 8, Neymar da Silva Santos Junior was summoned for the resumption of activities of the professional group of Paris Saint-Germain.
“Paris Saint-Germain found that the player Neymar Jr did not show up at the agreed time and place, without having been authorized by the Club in advance.
“Paris Saint-Germain deplores this situation and will take the appropriate measures resulting from it.”