The duo were both were substituted due to injuries while playing for Brazil and France on Tuesday night.
Paris Saint-Germain will be anxious about Neymar's injury, says club colleague Eric Maxim Choupo-Moting.
"They will undergo a 48-hour period of treatment before further evaluation", PSG said in a statement.
It appears likely that both players will miss PSG's Ligue 1 match against Toulouse on Saturday, but their real target will be Wednesday's Champions League match against Liverpool at the Parc des Princes.
Liverpool now hold a one point lead over PSG heading into matchday five but the Ligue 1 giants would be banking on home advantage to put themselves back into one of the top two slots.
As for Neymar, he suffered "an adductor injury while taking a shot in the sixth minute, and left Brazil's friendly against Cameroon in England".
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However, the Parisian were slightly relieved after Brazil's team doctor Rodrigo Lasmar said he did not expect the PSG's talisman abductor muscle injury to keep him out for long. He was replaced in the eighth minute but the national team doctor was optimistic that the injury was not serious.
"He came off complaining of pain", said Lasmar.
Asked if the Brazil global would be available for PSG's next games, Saturday's league encounter against Toulouse and the upcoming Champions League game against Liverpool, Lasmar said: "It's important to wait approximately 24 hours more".
Following the match, Neymar took to Instagram to provide an update.
It took Brazil's record since the World Cup to six wins in six games with six clean sheets.
Thanks to all who sent me messages wishing me a good recovery, I think it was nothing serious.
"We remain strong, focused and looking to always get better".
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