WWE has developed a new policy for dealing with concussions. If a Superstar or Diva even shows signs of a concussion, they are pulled from in-ring action and must pass an "ImPACT" concussion test before they can come back.
Even after passing the test, they are checked for signs of post-concussion syndrome (headaches, nausea, disorientation). Once they pass the test and are cleared of post-concussion symptoms, they are able to return. Fandango passed the initial "ImPACT" test but is still waiting for that second check to take place.