UEFA will announce today whether Cardiff has been successful in it's bid to host Euro 2020 matches.
After failing in the initial bid to be a host city, the Football Association of Wales submitted a renewed bid to stage the matches amid doubts over construction of Brussel's proposed new stadium.
The Eurostadium, north of the Belgian capital, is due to stage fixtures but has yet to be built.
Now UEFA's Executive committee will decide whether Brussels needs to be removed as one of the 13 host cities.
If the committee decide not to move forward with Brussels, either Cardiff, London or Stockholm will be chosen as a replacement city. London's Wembley Stadium is already part of the schedule as a venue.
But Cardiff's Principality Stadium has already staged major sporting events this year. It successfully hosted both the men's and women's UEFA Champions League Finals.
The Euro 2020 finals will celebrate 60 years since the first European Championship final was played.
A decision is expected to be made later today.