Senior Met officers have said they need to get "match fit" to effectively police the new Wembley stadium for the FA Cup final next month.
Wembley Stadium will host the FA Cup final on 19 May
About 1,000 officers will be on duty at the £800m stadium and around London when Chelsea and Manchester United compete for the FA Cup.
Troublemakers were warned they would be severely punished.
Wembley was given the go-ahead to host the match after being granted its general safety certificate last month.
Cdr Robert Broadhurst, who will be involved with policing on the day of the match, said extra officers would be on duty as police needed to get used to the "rhythm" of the ground.
"I do think we ourselves need to get ourselves match fit for such an occasion," he said.
He added: "We're hugely conscious in the planning of the Cup final that the Cup final itself is a world-class event now taking place at a world-class stadium.
"We owe to give it, if you like, world-class policing."
Normally about 700 officers would be involved with the event.
A state-of-the-art control room at the stadium will allow officers to use CCTV at the stadium and other parts of the city.
Asst Comm Tarique Ghaffur, speaking at a press conference outlining the policing measures, said: "I want to give a warning to people wanting to disrupt sporting events, that we will take very decisive action and they will bear the full brunt of the criminal justice system."
Cdr Broadhurst strongly advised fans to arrive early for the cup match and requested they use public transport to get to and from the event.
He added that random searches would be carried out by stadium staff which could delay fans, and advised fans therefore to allow extra time for their journeys.