The midfielder is on loan in France from Queens Park Rangers, who have indicated they may be prepared to sell their former captain after he was issued with a 12-match domestic ban.
Barton has himself admitted he would stay with Marseille if possible and he is certainly enjoying life with the Ligue 1 club.
"Coming to Marseille is one of the best decisions I've taken," he said. "I'm very happy to be here."
Marseille sit level on points with big-spending and star-studded Paris Saint Germain at the top of Ligue 1 with a game in hand and Barton thinks the title is not out of the question this season.
He said: "PSG have a great team with good players. With their financial strength who can say they won't spend another billion pounds in January?
"They have the means to do that. At Marseille we've got to take each game as it comes. We don't have a large squad.
"If we finish in front of PSG then that would be great. I came here to have a great season. Any team finishing in front of PSG will have had a good season."