Newcastle and Portsmouth were rumoured to be on the trial of the 25 year-old who cost the Asian team £8 million.
Diane helped the former French giants avoid relegation last season but was disciplined by the club for missing pre-season training.
"From now I want to ensure my family's financial future. And only a Qatari club can permit me to do it." Diane reportedly told Le Parisien.
Diane has signed a three-year deal with the seven-time Qatari champions.