Some have reacted to the news by declaring it 'Karma', others have simply laughed and some have declared Paulinho a 'culé' for life.
This person was in the latter camp, telling their Twitter followers: "Paulinho has injured Neymar in Brazil training. He's one of our own. Paulinho 'till I die."
Paulinho en el entrenamiento de Brasil ha lesionado a Neymar. Uno de los nuestros. Eterno Paulinho. pic.twitter.com/LH187OEhew
— ~ Barce ~ (@Barcelofia) October 4, 2017
This approach didn't do down well with some though, who called for respect.
Tampoco es eso... Ante todo respeto
— Terrier #SI (@TheTerrier55) October 4, 2017
The PSG man was forced to leave the session early after receiving knocks in challenges with both Paulinho and Tardelli. The blows were not severe, but they were significant enough to send Neymar back to the changing room early.
This was the challenge that ended Neymar's session:
Este vídeo hara a los culés un poco más felices. Paulinho lesiona a Neymar en el entrenamiento. pic.twitter.com/tfih1TdXxh
— VG SPORTS (@VGSports_) October 4, 2017
The incident continued to be the talk of social media, with one chap commenting: "Paulinho has done more for Barcelona in one training session that Arda Turan has managed in three years." Savage stuff.
Paulinho en un entrenamiento ha hecho más por el barcelonismo que el cojo de @ArdaTuran en 3 años.
— Aldahir Mayorga FCB (@aldahir_FCB) October 4, 2017