Unfortunately this is the story this time
"Jumper's knee - After the surgery the rehab and recovery progressed like planned on schedule. During the past weeks I was able to increase the training and the efforts put on the knee, with my sight set on Davis Cup, at least for doubles. The left leg did not recover its full strength back to a 100% level, and due to this the tendon was under too much stress and resulted in some aching around the knee area. Right now there is no specified due date when the leg should be ready for tournaments again. It's going to take as long as needed. Once I'm back to tournaments, I will be able to use the protected ranking system."