<Li> 1993--1994: Knockout semi-finals added following group phase . </Li> <Li> 1994--1997: One knockout qualifying round, group phase with four groups, group winners and all runners - up to eight - team knockout phase, one club per country (the league champion) plus the defending champion . </Li> <Li> 1997--1999: Two knockout qualifying rounds, group phase with six groups, group winners and two runners - up to eight - team knockout phase, up to two clubs per country . </Li> <Li> 1999--2003: Three knockout qualifying rounds, two group phases with eight first - phase group winners and all runners - up moving to four second - phase groups, second - phase group winners and all runners - up to eight - team knockout phase, up to four clubs per country . </Li>

Who has won the european cup back to back