Manchester United, eliminated from the Champions League after defeat to Atletico Madrid at Old Trafford on Tuesday, are likely to face punishment from UEFA after their fans hurled objects at visiting manager Diego Simeone.
Simeone sprinted towards the tunnel at the end of the game, which Atletico won 1-0 for a 2-1 aggregate victory, and had plastic bottles, drinks and other objects thrown at him.
The incident will likely feature in the UEFA match delegate's report on the game and that would trigger a disciplinary investigation and any eventual sanction.