Ron Vlaar has confirmed that he will spend the next four months on the sidelines with a knee problem.
The centre-back, who is a free agent following his recent release by Aston Villa, has been forced to undergo surgery on a torn medial ligament.
"Instead of two days with crutches, there will now be a four to six-week period. Instead of four weeks' rehabilitation, it will now take three to four months," the 30-year-old wrote on his blog.
"Two days after surgery the knee is very stable and that is the basis from which to start exercising."