Employers are being urged to discuss flexible working arrangements with their staff to allow them to start later in the morning after the Euro 2020 final.
The Trades Union Congress (TUC) said millions of workers will be watching England play Italy on Sunday evening – the biggest game for the men's national team since England won the World Cup in 1966.
General secretary Frances O'Grady said the game promises to be a "historic moment" for the country.
"We all hope the final against Italy is a cause for celebration," she said.
"Bosses should talk to their staff about flexible working arrangements ahead of Monday morning – perhaps allowing them to start later and claim back their time afterwards.
"And bosses should show flexibility too towards the 2.2 million workers who work on a Sunday – many of them key workers.
"Many of them will want to watch the match, and they should be able to, either at work or by finishing early and making up the time."
Ms O'Grady added that flexibility is not just important during the football tournament.
"Whether it's about major sporting events like the Euro 2020 final, attending a family celebration or picking up the kids from school, allowing people more flexibility in how and when they do their work makes them happier, cuts absenteeism and raises productivity."
Downing Street has said employers who are able to should be flexible about allowing staff to go into work late on Monday or take the day off if England win Euro 2020.
Prime Minister Boris Johnson's official spokesperson said: "We would want businesses who feel able to consider it if they can, but we recognise it will vary depending on the business and company."
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