The PSG attacker criticised Barcelona’s president in a comment on Instagram.
Neymar called Josep Maria Bartomeu ‘a joke’ for the comments he made about his father.
The Brazil international completed a record breaking €222m move last month to PSG.
Bartomeu was perplexed by the antics of the Brazilian’s father and his agent which aided his move to the French capital.
“We made the mistake of trusting Neymar and his father too much,” Bartomeu said.
Neymar responded to an Instagram post which revealed Bartomeu’s quote, saying: “This president is a joke”.
Barcelona however signed Ousmane Dembele to replace the 25-year-old.