Both of those competitions have witnessed format alterations, with expansions in the number of taking part groups, introduction of new rounds, and adjustments in qualification standards through the years. The group phase was played from September to December, although the knockout stage commenced in February, with matches ordinarily played on https://xembngtrctipkonhci18416.aboutyoublog.com/42469630/about-what-are-the-uefa-champions-league-and-uefa-europa-league