Both of those competitions have found structure changes, with expansions in the amount of taking part teams, introduction of new rounds, and changes in qualification criteria over time. The team stage was played from September to December, while the knockout stage started in February, with matches typically played on Tuesday https://keo-nha-cai-563940.bloggip.com/36531693/an-unbiased-view-of-what-are-the-uefa-champions-league-and-uefa-europa-league