Balls must comply with the IFAB Laws of the Game as well as with the UEFA Equipment Regulations.
The host association must provide balls for all matches and training sessions of the league phase, quarter-finals and play-offs.
For matches and official training sessions during the finals, balls are supplied exclusively by UEFA.
The use of two-sided substitution boards (preferably electronic) is compulsory for all matches. For each match a minimum of two boards must be provided by the host association.