The Dutchman wants out, despite still having three years on his current deal with the London club.
He told De Telegraaf: " I think you always have to blame yourself first.
"If I had played at the high level I did in 2010 there would be no reason for the coach to overlook me.
"I came to Fulham to keep the club in the Premier League and to fight to get myself in the World Cup squad. I failed on both counts."
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