And while Barcelona are keen to bring Neymar back under the right circumstances, former club boss Van Gaal feels re-signing Neymar would be a bad move for the La Liga club.
"I think it's not good for Barcelona, but that's my opinion," the Dutchman told La Porteria de Beteve.
"Neymar is still a young player who can continue to develop. He must first learn to be a team player.
"Neymar is too individualistic, which is why I think Barcelona should be vigilant before deciding to get him back."
Neymar scored 105 goals in 186 games for Barca before leaving for PSG for a world-record transfer fee of €222 million (£195m/$260m).
He is now in his second season with the French outfit, having seen his first cut short through injury. The Paris club look set to roll to another Ligue 1 title, having opened up a 15-point gap at the top of the table with Neymar scoring 10 times and adding five assists in 14 league matches so far.
Neymar scored a brilliant hat-trick in a 6-1 win over Red Star Belgrade but has been held silent in the club's three other Champions League outings, a 3-2 loss to Liverpool and two draws with Serie A outfit Napoli.
A win on Wednesday would put PSG in prime position to advance from Group C, but the club sit a point back of both Napoli and Liverpool heading into matchday five.
PSG will return to the friendly confines of league play at the weekend, with a fixture at Bordeaux set to open up their December slate.