Both of those competitions have found structure improvements, with expansions in the volume of participating teams, introduction of recent rounds, and adjustments in qualification criteria through the years. The group stage was played from September to December, although the knockout phase commenced in February, with matches generally played on Tuesday https://t-l-k-o-nh-c-i-552849.loginblogin.com/44123768/about-what-are-the-uefa-champions-league-and-uefa-europa-league