The 33-year-old Norwegian international, who joined the club in 2011, is due to be a free agent at the end of the current season.
Despite a new contract at Craven Cottage looking unlikely, Riise wants to help the team to stay in the Premier League before deciding his next move.
"Right now, I am doing everything I can to help Fulham to stay in the Premier League," he told VG.
"Nothing else matters right now. The future I will think about after the season. Then, I will be free and can choose whatever I want and where."
Fulham are currently two points adrift of safety in the Premier League table with four games left to play.