Neymar was involved in a training ground fight with a Barcelona team-mate Nélson Semedo during a training session in Miami, Daily Mail reported.
After the incident, Neymar tore off his training bib and threw it to the ground as manager Ernesto Valverde stood helpless close by.
PSG remain confident of signing the 25-year-old having held talks with Barcelona officials last week over the structure of the €222m fee.
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