Has any team won the Champions League undefeated?

Ten clubs have managed to lift the trophy without losing a single match. Whether under the old name and format of the European Cup or the current Champions League, only ten clubs have achieved this feat, some of them twice.

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They are worth reviewing: Inter in the 1963/64 season, Ajax in 1971/72 and 1994/95, Nottingham Forest in 1978/79, Liverpool in 1980/81 and 1983/84, Milan in 1988/89 and 1993/94, Red Star in 1990/91, Olympique Marseille in 1992/93, Manchester United in 1998/99 and 2007/08, Barcelona in 2005/06 and Bayern Munich in 2019/20.

Inter 1963/64 

Inter played 9 matches from the preliminary round of direct elimination until the final against Real Madrid, winning 7 of them and drawing two. They left Everton, Monaco, Partizan Belgrade, Borussia Dortmund, and the aforementioned Merengue team in the final played in Vienna.

Ajax 1971/72 and 1994/95

It was the second title of the treble they finally won, in a campaign similar to that of Helenio Herrera's Inter: they won 7 matches, drawing the remaining two. Their path to the title was marked by Dinamo Dresden, Marseille, Arsenal, Benfica, and Inter, whom they defeated in the final.

The Dutch team's second undefeated crown, now under the new format, allowed them to win four matches and draw two in the group stage, which they shared with Milan, Salzburg, and AEK Athens. In the quarterfinals, they defeated Hajduk Split, in the semifinals Bayern Munich, and in the final Milan, to close their campaign with seven wins and three draws.

Nottingham Forest 1978/79

Of the nine matches that led to the first of their two titles, Forest won six and drew three. Their opponents from the round of 16 to the final match were Liverpool, AEK Athens, Grasshopper, Cologne, and Mälmo.

Liverpool 1980/81 and 1983/84

The Reds' third title gave them the following record against OPS Oulu, Aberdeen, CSKA Sofia, Bayern Munich, and Real Madrid: seven wins and two draws. On a colorful note, they beat OPS Oulu of Finland 10-1 in the second leg of the round of 16.

And the fourth title two seasons later, they repeated the numbers of seven wins and two draws, one of them in the final against Rome, which they ended up winning on penalties 4-2. To reach that final at the Olimpico they had to get rid of Odense BK, Athletic Club, Benfica, and Dinamo Bucharest. 

Milan 1988/89 and 1993/94

Arrigo Sachi's Rossoneri won five times and drew four more to win the then European Cup against Steaua Bucharest. On their way to the championship, they also beat Vitosha Sofia, Red Star, Werder Bremen, and Real Madrid.

The following consecration, now under Fabio Capello, was memorable for the 4-0 thrashing of Johan Cruyff's Dream Team, which rounded off a campaign of three wins and a draw in the round of 32 (vs. Aarau of Switzerland) and the round of 16 (vs. Copenhagen) plus two wins and four draws in the quarter-final group against Porto, Werder Bremen, and Anderlecht. In the semifinals, they won 3-0 against Monaco to give the final blow in Athens against the Catalans.

Red Star 1990/91

The Serbians' only title was won in five wins and four draws, the last of which came in regulation time in the final against Marseille. The 12-goal shootout gave them the glory with a 5-3 win. Grasshopper, Rangers, Dynamo Dresden and Bayern Munich were the opponents at that time.

Olympique Marseille 1992/93

Revenge for the French side came two seasons later, inaugurating the new format and name of the Champions League. Glentoran of Northern Ireland and Dinamo Bucharest succumbed in the first two rounds where Marseille won three matches, drawing the remaining one. Then in the group against Rangers, Brugge, and CSKA Moscow, Marseille earned nine points from three wins and the same number of draws. Finally, it won the final at the Olympiastadion in Munich against Milan.

Manchester United 1998/99 and 2007/08

The Red Devils' title in the 98-99 season is more remembered for the thrilling final against Bayern Munich at Camp Nou, than for their campaign itself, where they had 6 wins (including the agonizing 2-1 win over the Bavarians) and 7 draws. However, it was a campaign to highlight, because after leaving ŁKS Łódź in the second preliminary round, they entered Group D with representatives like Bayern Munich, Barcelona, and Brondby and then eliminated two Italian giants: Inter and Juventus.

Something similar happened in the final of the 07-08 season, the first between English teams, which pitted United against Chelsea in Moscow. The final (1-1), which was decided on penalties in favor of the Red Devils, was the culmination of a campaign that yielded five wins and a draw in the group stage, where they faced Roma, Sporting Lisbon, and Dynamo Kyiv. Then against Lyon, Roma again and Barcelona in the final stages, they won four matches and drew two.

Barcelona 2005/06

The Culés' second Champions League title began in the group stage with five wins and a draw against Werder Bremen, Udinese, and Panathinaikos. Following that, four wins and three draws were recorded against Chelsea, Benfica, Milan, and Arsenal in the final in Paris.

Bayern Munich in 2019/20

Bayern Munich was crowned in an unusual edition of the Champions League due to the Covid-19 pandemic. And to make this title even more unusual, the Bavarian team did it undefeated and won all its matches until lifting the Orejona.

They faced Steaua Bucharest, Tottenham Hotspur, and Olympiacos in the group stage, winning all six matches. In the knockout rounds, they beat Chelsea in the round of 16 over two legs and then defeated Barcelona in the quarterfinals, Lyon in the semifinals, and PSG in the final. Winning 11 games out of 11 played.

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