The fans were sprinting around the pitch, desperately trying to avoid stewards as they chased the striker.
Neymar seemed to take the incident in good humour and appeared to be defending the youngsters to officials leading them away.
The Brazilian striker is one of the most popular athletes in his country, and a few crazed fans took advantage of an open training session that was perhaps a bit too open.
Having helped his national side to a gold medal at the home Olympics, the legend of Neymar goes from strength to strength and it seems everyone wants a piece of the Barcelona striker.
Brazil were preparing to face Colombia in their opening World Cup qualifying game.
More than 15,000 fans turned out to watch their beloved men in yellow train ahead of the clash and security did not seem fully prepared.
In the end two fans managed to evade security to hug the striker before hauling him to the ground.
Having been embarrassed by Germany at their home World Cup, Brazil will be looking to qualify and restore the gloss to their reputation.