The 30-year-old has admitted to the club’s recent form slump.
“It’s a little difficult at the moment, but we will find ways to return,” he told L’Equipe. “I hope in the Champions League we will do well.
“You can’t have a 10-year career where everything is great. I am in a period like that – a little less good.
“Is this difficult to experience? If I say no, people will say I am not ambitious. If I say yes, people will think I am demoralised when it is really not the case.
“It is not easy but it is not the end of the world. The main thing is that I am in good health physically.”