Englishman Barton, 30, recovered ahead of schedule from an adductor strain and completed a conditioning session on Wednesday.
Sunday’s Ligue 1 match at Nice may be too soon for the on-loan QPR midfielder, but he is expected to feature in the season run-in.
Third-placed Marseille are also without defender Kassim Abdallah (thigh), who should return within the next week.
Midfielder Morgan Amalfitano has, however, returned to full training after a long-term knee problem and could be included in the squad for the trip to the Cote d’Azur.
- Sports & Recreation