Filipe Luis is in danger of missing the World Cup after suffering a broken leg during Atletico Madrid's Europa League clash with Lokomotiv Moscow.
The Brazil international was substituted after 62 minutes of Thursday's second-leg tie, which Atleti won 5-1 to progress 8-1 on aggregate, after being left writhing in pain following a last-ditch challenge with Lokomotiv forward Eder.
Having been caught by the striker's follow-through, Filipe Luis left the pitch on a stretcher, with coach Diego Simeone expressing his concern for the defender in a post-match interview.
Atleti's fears were realised following checks on their return to Madrid, the LaLiga club confirming the details of the 32-year-old's injury on Friday.