The 29-year-old has long been linked with a move away from Rangers.
Barton had fallen out with QPR boss Mark Hughes and wanted to leave the Premier League side.
Barton had to wait until Stephane Mbia reached an agreement to join Queens Park Rangers before he could complete his move to the French side.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?