The 33-year-old has not featured for the club since the loss at Newcastle at the end of August, with Kieran Richardson now Martin Jol's preferred choice at left-back.
Now Riise admits that he will be looking to move in January if his situation does not change - with his current deal due to expire in the summer.
"I speak to the gaffer all of the time. We both know how I'm thinking. I'm obviously not happy not playing," he told the Fulham Chronicle.
"I feel fit and if I get a chance I'm ready. If not, then we'll look somewhere else to see if I can get a move.
"I'll remain professional, whether I'm going to leave or not. I always give 100 per cent in training and if I play, the gaffer knows that.
"I'll work hard until January and see what happens. If it doesn't happen, then I'll work hard until May.
"I'm never going to be a player who moans. I want to keep fit, work hard every day and be ready if I'm needed. If not, I will look elsewhere."