The man was wearing a white shirt with the number 97 and the words "not enough" on the back.
Some Twitter users suggested that the slogan referred to the Hillsborough Disaster, in which 97 Liverpool fans died as a result of a crush in 1989 at Hillsborough Stadium.
Police confirmed that a man had been arrested on suspicion of a public order offence and was taken into custody.
The Metropolitan Police tweeted that they had worked "proactively" with officials at Wembley Stadium to identify the individual.
The force also confirmed that they were investigating after an object was thrown towards the pitch during the first half of the game.
CCTV footage is being reviewed to identify the person responsible.
The Metropolitan Police's events Twitter account shared a tweet by Liverpool FC fan account The Kop Watch, saying, "We are aware of this and have worked proactively with officials at @wembleystadium to identify the individual.
He has been arrested on suspicion of a public order offence and taken into custody." The Met said that it is investigating the incident and reviewing CCTV footage to identify the person responsible.
The force did not confirm whether the slogan on the shirt was related to the Hillsborough Disaster.
The BBC reports that the Met is also investigating the incident in which an object was thrown towards the pitch during the first half of the game.
The stadium officials and CCTV footage are being reviewed to identify the person responsible.
The FA Cup final between Manchester United and Chelsea was held at Wembley Stadium on 18 May.
The match ended in a 1-1 draw, and the trophy was won by Manchester United in a 3-1 victory in the replay on 26 May.
LONDON DAILY ARCHIVE
Man Arrested During FA Cup Final for Controversial Slogan on Football Shirt
A man has been arrested during the FA Cup final at Wembley Stadium after concerns were raised about a slogan on a football shirt.
03 June 2023 · 20:45 UTC
