Train security 'to be tighter'.
Chief Inspector Sandra England, BTP's Sector Commander for Wales, said it was very much "business as usual" for her staff but with a "twist of the Olympics".
The Chief Insp said BTP officers in Cardiff were well practised in crowd management having had regular experience with sell-out crowds during the annual Six Nations tournament.
She added: "Obviously there will be the heightened risk of the Olympics so there will be tighter security."
The Millennium Stadium will host 11 football matches in total, including the first Olympic event on July 25, a GB men's group game and the bronze medal play-off on August 10.