London - Manchester City said Thursday that one of their fans was "in a critical condition in hospital" following an alleged assault after their Champions League match against Schalke.
Pep Guardiola's Premier League leaders sealed a dramatic 3-2 win in Germany on Wednesday despite being down to 10 men after Nicolas Otamendi was sent off.
The victory in the first leg of the last-16 tie leaves them firm favourites to progress to the quarter-finals.
City issued a statement on their website on Thursday saying they were "aware of an alleged assault after the match".
"The club are working with Greater Manchester Police and German Police to ascertain more information," it said.
"Club staff have remained in Germany to support the family of an injured City fan who is currently in a critical condition in hospital."