Goldust
Goldust has been sidelined now since July after it was revealed that he would need surgery on both of his knees. The WWE legend has already undergone the procedure but it is unknown as to when he will be returning to the company since he is now seen as a legend who is only used when WWE has creative plans for him.
The prognosis was around eight months, but it could take much longer for him given his age so it appears that a Royal Rumble dream return could be out of the question.
Kevin Owens
Kevin Owens was last seen on WWE TV back in October when he was attacked and put out of action by Bobby Lashley so that he could be written off WWE TV to have legitimate knee surgery. Owens later updated an image that showed that he had a procedure on both legs and would now be forced to rehab if he had any hope of returning to WWE at WrestleMania.
The former Universal Champion could be looking at a return to the ring in late February, which means that there is still enough time to be slotted into next year's WrestleMania.