The Brazil star has not yet featured under Mauricio Pochettino, having sustained an ankle injury in December.
According to Le Parisien, the former Barcelona forward is "50-50" to face Marseille in Wednesday's game in Lens.
Neymar has only managed seven Ligue 1 appearances this season, scoring three times and providing three assists.
Leandro Paredes, Danilo Pereira and Presnel Kimpembe, who suffered a hamstring injury last month, also returned to training in Monday's session.
Pochettino, who took over following Thomas Tuchel's sacking in December, is bidding to win his first trophy as a coach this week.
He recorded his first win as PSG boss on Saturday, when Moise Kean, Mauro Icardi and Pablo Sarabia scored in a 3-0 Ligue 1 victory over Brest.