But QPR have yet to strike a deal with the Ligue 1 side due to Barton's wages, so the 30-year-old had to show up at pre-season training in Harlington, west London.
And prior to linking up with his Rangers team-mates, he tweeted: "Up and off to training today. 1st day back. Like a new term at school. Albeit a school, you were once expelled from..."