Barton is currently on a season-long loan at Marseille and has revealed he would be open to extending his stay with the French side.
The 30-year-old, who was banned for 12 matches and fined £75,000 for his behaviour in the defeat on the final day of last season at Manchester City, was also quick to criticise his parent club on Twitter following the Hoops' relegation on Sunday afternoon after their 0-0 draw at Reading.
However, Fernandes insists unless a transfer fee can be agreed, then Barton, signed from Newcastle on a free in August 2011, would be expected back at pre-season training ahead of their Championship campaign.
"Marseille have got to put an offer in," Fernandes told QPR Player. "Joey is under contract and Joey would be a very useful player for Queens Park Rangers.
"He helped Newcastle out (of the Championship). Some would say we lacked his fighting spirit in the midfield.
"But if Joey and Marseille want (the transfer), then we will talk. However, he is a QPR player, and is contracted to QPR.
"That has to be a financial deal which would have to be worked out if he wants to go to Marseille, but as far as I am concerned he is a QPR player and in the summer will come back."