Real Madrid star Gareth Bale faces two months on the sidelines.
Marca reports initial fears that Bale will miss December's Clasico have been compounded by the confirmation that surgery is required to solve a dislocated ankle tendon.
Taking place in London's King Edward VII hospital on Tuesday, renowned surgeon and ankle specialist Dr. James Calder will oversee the operation, alongside club doctors Jesus Olmo and Mikel Aramberri.
The upshot is that Bale will miss at least two months of Real Madrid game time, ending his involvement until around the start of February.