South Wales Police have described the Champions League final between Juventus and Real Madrid as the "biggest single sporting security operation in the U.K." following the terror attack on Manchester last Monday.
The game, which takes place in Cardiff on Saturday, is expected to attract 170,000 supporters on the day of the game and 200,000 across the week, but police say no changes have been made to their plans with searches of drains and underground access points already being carried out in preparation.
Speaking at a news briefing ahead of the event, South Wales Police Superintendent Steve Furnham said the security operation was "unprecedented," with 2,000 officers reported to be on duty in Cardiff on the day, including armed officers.
South Wales Police will be the first force to use facial recognition software, which will be linked to CCTV cameras around the city to monitor people who may already feature on hooligan or terrorist watch lists.
Meanwhile, this will be the first Champions League final to be played under a roof after the Football Association of Wales announced it will be closed for safety and security reasons.
Following the Government's decision to raise the national terror threat level to critical in the wake of Monday's terrorist attack at the Manchester Arena, several sports have reviewed their planned events.
The decision has been made to close the roof on the 75,000-seater venue for both the two official training sessions on Friday June 2 as well as the final.
The stadium, which is being temporarily renamed the "National Stadium of Wales," will also host the Women's Champions League final between Lyon and Paris St Germain on June 1, again with the roof closed.
Information from the Press Association was used in this report.