The Brazilian was forced off the pitch with a groin problem during his nation's global friendly against Cameroon at Stadium MK.
Paris Saint-Germain have confirmed that both Neymar and Kylian Mbappe suffered injuries during the global break and will be assessed by the club in the next 48 hours, ahead of the crucial Champions League clash with Liverpool.
The 19-year-old was withdrawn before half time in France's 1-0 friendly win against Uruguay when the forward fell awkwardly on his right shoulder after a challenge by Uruguay goalkeeper Marin Campana.
PSG's night then got even worse as fellow star forward Mbappe picked up what appeared to be a very painful shoulder injury as France took on Uruguay in their friendly at the Stade de France.
Brazil team doctor Rodrigo Lasmar said: "He felt discomfort".
Thanks to all who sent me messages wishing me a good recovery, I think it was nothing serious.
On Wednesday, PSG announced that Mbappe has a bruised shoulder, while scans on Neymar showed a right adductor strain.
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Kylian Mbappe reacts after sustaining an injury.
Neymar was Brazil's match victor against Uruguay on Saturday but went down in pain after attempting a shot in what appears to be a muscle injury.
PSG return to domestic action against Toulouse on Saturday before they face Liverpool in a crucial Champions League clash at the Parc des Princes on Wednesday.
PSG now sit third in Group C, just one point behind second-placed Liverpool.
"These last games were important to recover from the biggest hit that was the World Cup, we remained strong, focused and aiming to be increasingly better".
"He was evaluated and he has already started treatment, but will need a little bit more time to have a better assessment, with a scan, but initially it doesn't seem like an important injury".