The Frenchman told setantasports.com: "Some clubs can't be snubbed and Rangers are one of those.
"I haven't received any concrete offer from them, but everything can be done very quickly before the market closes.
"Playing there would be a superb option, as they are a very big club. I could play Champions League for them, which would be fantastic.
"Yes I play regularly, but Birmingham have signed a new left back, so I don't know what they are planning to do.
"I have to see what will happen and it would definitely interest me."