UEFA issues new regulations for the Champions League and Europa League.

UEFA has announced new regulations that will be applied to the continent's two most prestigious competitions, the Champions League and the Europa League, starting next year.

These regulations will help make competitions held on weekdays more attractive.

Real Madrid is currently the most successful team in the Champions League with 12 titles.

According to an announcement on its official website, Europe's most powerful football governing body will allow three players to continue playing after moving to a new club, regardless of whether they have previously played in European competitions.

This eliminates the limitation that a player can only choose one of the two competitions. The best examples are Philippe Coutinho and Alexis Sanchez.

The Brazilian midfielder was ineligible to play for Barcelona because he had already progressed through the group stage of this year's Champions League with Liverpool; while the Chilean player was allowed to play for Manchester United because he had previously only played for Arsenal in the Europa League.

Two other rules that are also worth noting are the changes regarding substitutions. Specifically, from the knockout round of both competitions, teams will be allowed a fourth substitution during extra time.

Additionally, in the Champions League, Europa League, and UEFA Super Cup finals, each club will have 23 players registered in their starting lineup, instead of the previous 18.

UEFA's new regulations were approved on March 3rd by the IFAB – the body responsible for the rules of football.