Joao Felix is set for a spell on the sidelines after Atletico Madrid confirmed he suffered a grade two sprain to a right ankle ligament against Valencia.
Portugal international Joao Felix, who joined Atletico in a €126 million (£113m/$142m) transfer from Benfica in the close season, limped out of Saturday's 1-1 La Liga draw at the Wanda Metropolitano with 10 minutes remaining.
The 19-year-old appeared to twist his ankle in a challenge with Dani Parejo and left Diego Simeone's side down to 10 men, having used all three of their substitutions.