Richarlison headed in on the stroke of half-time for his third Brazil goal as the Selecao beat Cameroon 1-0 in a friendly in Milton Keynes.
Neymar could be an injury doubt for Paris Saint-Germain's Champions League clash with Liverpool next week after limping off during the victory.
The forward suffered an apparent groin problem and was replaced after eight minutes, to boos from a record Stadium MK crowd.
A mixture of cheers and jeers welcomed Neymar to the ground in central England, his World Cup theatrics in Russia providing ammunition for his detractors.
And there was little sympathy when the star attraction went off after making little impact.
He sought treatment after five minutes and returned to send a curling right-footed shot high and wide within a minute. He immediately collapsed before being replaced.
Richarlison appeared dangerous from the moment he was introduced and Roberto Firmino went close three times.
The Liverpool striker almost turned in Willian's cross but Andre Onana made a fine instinctive save.
Firmino next sent a free header wide from Richarlison's cross and was then denied by the goalkeeper from point-blank range.
Richarlison scored from the resulting corner, powerfully heading in Willian's set-piece.
Cameroon came close to drawing level after 52 minutes, but Stephane Bahoken could not get a touch on Karl Toko Ekambi's cross.
Fabrice Ondoa almost gifted Brazil a second when Ederson cleared downfield and the Cameroon substitute goalkeeper came 30 metres out of goal before colliding with Yaya Banana.
Manchester City's Gabriel Jesus, on for Firmino, was through, but could only hit the post from a tight angle.
Jesus's City team-mate Danilo shot just wide soon afterwards and Barcelona midfielder Arthur next struck the top of the crossbar from 25 metres.
Napoli's Allan fired straight at Ondoa with four minutes to go and then the latter made a double save, first denying Jesus and then Richarlison.
Jacques Zoua hit the woodwork with a header in the final moments as Cameroon missed out on a late equaliser.