[1] Using these regulations, stadiums are rated as category one, two, three, or four (renamed from elite) in ascending ranking order.
These categories replaced the previous method of ranking stadiums on one to five star scale in 2006.
A stadium must be rated as category four in order to host games in the playoffs of the qualifying stage for the UEFA Champions League, or any game in the main competition.
[1] If a retractable roof is present, its use will be directed by consultation between the UEFA delegate and the main assigned referee.
After the 2007 Champions League final, UEFA President Michel Platini stated that he wanted European Cup finals to be held at stadiums with an average capacity of 70,000 to solve security issues.