1990–91 European Cup
The European Champion Clubs' Cup in 1990/91 was the 36th edition of the competition. 31 club teams participated, including 30 national champions from the previous season and with AC Milan, the defending champion. With Red Star Belgrade won only the second time after Steaua Bucharest in 1986 an Eastern European team competition. Scene of the finale was on 29 May 1991 Stadio San Nicola in Bari, Italy.
For the first time after a five -year ban because of the Heysel disaster of 1985 had English teams are allowed to go to the start, but the skilled champions FC Liverpool had been suspended for six years. In addition, Ajax Amsterdam could not compete as champions of the Netherlands due to a one-year lock also.
Mode
The competition was the last time in pure Cup mode with home and away matches (except the final) discharged. In Torgleichstand first counted the greater number of away goals scored; there was also this a tie, the second leg was extended and, if appropriate, immediately then discharged a penalty shootout to decide.
First round
Bye: Italy AC Milan
The first legs took place on 2 and 3 October 1990 on 18 and 19 September, the return games.
2nd round
The first legs were held to 25 October, the return matches on 6 and 7 November 1990 23.
Quarterfinals
The first legs took place on 20 March 1991 on the 6th, the return games.
Semifinal
The first legs took place on 24 April 1991 on the 10th, the return games.