You're happy for the 1% (by your reckoning) to lump it, on the ref's say so? I'm glad you're not a medical professional and just a nutter on a football forum.Azpilicueta had a head injury today - everybody knew it and play stopped instantly, pretty much wthout the need for any action from the referee. Hint, then, for referees - if it's a head imjury, it's pretty obvious. If the player is clutching his face with his hands, rolling over and screaming blue murder there is a 99% chance it's not a head injury.
If the physios subsequently come on and treat his ankle, give him a yellow card. Second time, it's a red. It's not rocket science.