Up to 10,000 people are due to attend the funeral and thanksgiving service for football legend Alan Ball.
Ball was a key part of England's World Cup winning team in 1966
The size of the predicted turn-out for Thursday's service at Winchester Cathedral has led Hampshire police to warn other people to avoid the city.
Those planning to attend are being urged to use public transport and a park-and-ride site has been set up.
World Cup winner Alan Ball died of a heart attack at his home in Warsash, Hampshire, last week, aged 61.
ALAN BALL FACTFILE
Born: Farnworth, Lancashire 12/05/1945
Playing career: Played for Blackpool, Everton, Arsenal, Southampton, Philadelphia Fury, Vancouver Whitecaps (player manager), Blackpool (player manager), Southampton, Eastern (Hong Kong), Bristol Rovers
Made 975 appearances in a 21-year career
Managerial career: Portsmouth, Colchester, Stoke, Exeter, Southampton, Manchester City, Portsmouth
Honours: World Cup (1966), league title (1970)
Ball was the youngest member of the England side that won the World Cup in 1966 and went on to win 72 caps.
The midfielder started his career at Blackpool and went on to play for Everton, Arsenal and Southampton before a spell in the United States.
Ball, who collapsed outside his home after tackling a bonfire, also managed seven clubs, including Portsmouth, Southampton and Manchester City.
His memorial service will take place at 1300 BST.
Sgt Neil Jenkins, of Hampshire Constabulary, said: "It is clear that many people wish to attend the service to pay their respects to Alan Ball, and the event may attract thousands to Winchester.
"We would also advise that no-one attempt to drive into the city centre, due to the large amount of congestion that may occur.
"Our main aim is to ensure that the service goes according to plan in a respectful and safe manner, and to make sure that those not attending it are able to go about their business in and around Winchester."