Javier Manquillo suffered a nasty blow and was hospitalised after he landed on his head following a challenge by Cristiano Ronaldo in Tuesday's Copa del Rey derby.
An Atletico statement, via goal.com, read:
The posterior part of the medical tests that he underwent confirm that Javier Manquillo suffers whiplash. A neurological examination came out normal and he has been admitted to the hospital for observations.
It was a mixed night for Ronaldo, whose Real team progressed to the final but he was also hit on the head by a lighter thrown from the crowd.