However, Fernandes has insisted that if Marseille do not match QPR's valuation of the 30-year-old, then he will stay at Loftus Road.
"Marseille have to put an offer in. Joey is under contract," he told the club's official website. "There has to be a financial deal that needs to be worked out.
"He would be a valuable player for QPR and helped Newcastle out [in the Championship]. Some people say we lacked his spirit in midfield."
Barton joined QPR on a free transfer from Newcastle United in 2011.