However, the Netherlands international is prepared to play through the pain and put any operation back until January to help Swansea through a hectic December schedule.
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"I have had some problems with my left knee for a while and I need to get it sorted," he said.
"It keeps swelling up. It has happened a couple of times in the last few weeks. We have tried to manage it and I have played a few games, but I have to leave it a while to be ready for the next game and it is getting worse and worse.
"I had a scan again on Monday and there is a tear in my knee which is a bit bigger. We knew then we had to do something about it.
"We will try to manage it this month, and then at the beginning of January I will have an operation and be out for around four weeks.
"We still have five or six games until the beginning of January. I hope my knee settles down and I can play but then we need to get it done, not only for Swansea but for the World Cup as well."