Each competitions have viewed format improvements, with expansions in the volume of participating groups, introduction of recent rounds, and changes in qualification criteria through the years. The group stage was played from September to December, whilst the knockout stage began in February, with matches generally played on Tuesday and Wednesday https://tlkonhci87417.ageeksblog.com/35138991/the-what-are-the-uefa-champions-league-and-uefa-europa-league-diaries