The 30-year-old spent last season on loan at the Stade Velodrome, helping the Ligue 1 outfit secure a return to the Champions League, but no deal has been agreed to make the move permanent.
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"Recent rumours are slightly wide of the mark, everyone knows where I would like to end up, in France," the 30-year-old posted on his Twitter account.
"Playing in the Champions League for Olympique Marseille, nothing has changed my end. If not, I am contracted to QPR and will give my all ... to help them regain their Premier League status. If something happens and both clubs decide differently than I will assess my options."
Barton made 33 appearances in all competitions for Marseille last term, scoring one goal.