The £126 million 73,000-seater stadium has been chosen to host the season’s showpiece game while Wembley is being rebuilt.

Police have warned that traffic delays into the city are ‘‘inevitable’’.

Spectators had been asked to travel to the game by coach or train in a bid to ease traffic congestion, but according to the Welsh Assembly’s traffic control centre, indications are that the majority are coming by car.

Fans travelling to the game will be able to gain access to latest travel advice for the area on the web site www.traffic-wales.com and a telephone information line has been set up on 0845 602 6020.

Railtrack has rescheduled engineering works that were due to take place in the Severn Tunnel on Saturday so train operators can run normal services.

Extra trains from London, Manchester and Liverpool have been arranged on top of the normal Saturday service.

A total of 34 trains will arrive in Cardiff before 2pm and for the return journey contingency plans have been made for extra time and penalties.

The Football Association gave the stadium the green light this week after problems with the pitch were solved.

A new pitch had to be laid last week at a cost of £100,000 after the FA said it was not good enough to host the showpiece final.

Paul Newman, spokesman for the FA, said: ‘‘The pitch looks sensational and we are very pleased with the preparations.’’

A total of 800 police officers will be on duty in Cardiff on the day, but Superintendent Neil Jellings, in charge of policing, said he is not expecting any trouble and is hoping for a ‘‘carnival atmosphere’’.

He said: ‘‘Cardiff is a fantastic city and we would encourage people to stay and enjoy themselves here.

‘‘We will react very quickly to any disorder that occurs. Our intention is to make it a day for families.’’

It is Liverpool’s second visit to the Stadium this season after they won the Worthington Cup final against Birmingham City in February.

The FA Cup Final is watched by an estimated television audience of around 400 million around the world and is expected to generate significant revenue in Wales.

Welcoming the final to Cardiff, Welsh sports minister Jenny Randerson said: ‘‘On Saturday, Wales will capture a piece of sporting history as it will be the first time that the FA Cup has been played outside England.

‘‘Hosting such a prominent sporting event at the Millennium Stadium is a fantastic achievement for Cardiff and for Wales as a nation.’’