Celebrating Chelsea fans are believed to have defaced the statue of Winston Churchill in London's Parliament Square in the hours after their team won the Champions League on Saturday.
The graffiti on the monument to the former Prime Minister who led Britain to victory in the Second World War said "Chelsea", "CFC" and "1905", the year the club was founded.
Police were at the statue in Westminster today with Scotland Yard said CCTV footage of the incident will be analysed to identify those responsible.
Chelsea beat competition favourites and Premier League champions Manchester City 1-0 in a cagey affair in Portugal, with thousands of fans making the trip to the green-listed country.
The final had originally been set to take place in Turkey before the UK Government placed it on the red-list, therefore banning travel.
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A force spokesman told The Daily Telegraph: "On the morning of Sunday, 30 May, officers noted ‘Chelsea FC’-related graffiti on the plinths of two statues in Parliament Square.
"This has been recorded as criminal damage.
"CCTV footage will be analysed to identify the person(s) responsible."
In the days before the match at FC Porto's Estádio do Dragão, footage shared across social media showed fans of both clubs chanting and clashing in the streets of the city, including throwing chairs at each other.
Mayor Rui Moreira said one person had needed hospital treatment, but that their injuries were "nothing serious".
He told Sky Sports News: "We had to shut down the bars and the pubs because that's the law, the curfew law, by 10.30pm people had to leave.
"Between the fans, there was some aggression. One guy went to hospital, it was nothing serious, no arrests. People went to their hotels and it always happens. We have this experience also with our national games.
"You can't change it, that's life, but nothing that concerns us so far."
Manchester City were appearing for the first time in the elite competition's final but Chelsea went on to pick up the trophy for a second time in their history with a goal from Kai Havertz.
The Mirror has contacted Chelsea FC for comment.
