Buffel fires quit warning at Rangers
He said: "I've spoken twice with the manager and he told me I'd get my chance in the team. But since then I've been fit for three months, and not been given a call-up.
"I'll wait for three more weeks and if I still haven't played by then, I will want to leave.
The 26-year-old added: "Ally McCoist said in an interview he dreams about Rangers winning the title with 11 Scots in the side.
"And when you look at our team against Lyon in the Champions League, with nine Scottish players on the pitch, that's a clear indication of the way things are going.
"There is a sufficient number of clubs interested in me."