In Pics | Football teams to win the treblePep Guardiola's Manchester City edged past Inter Milan, whose manager Simone Inzaghi admitted going into the match that their side would be underdogs, in the Champions League final Sunday. With the 1-0 victory, City won the first Champions League in the club's history and also managed to win the treble their neighbours Manchester United had done in the spectacular Alex Ferguson-managed 1998-99 season. Manchester City have now won the English Premier League, FA Cup, and Champions League in the same season, cementing the club's spot in an exclusive list of European clubs who have achieved the same feat. Here is a look at all clubs to win the treble. 
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In Pics | Football teams to win the treble
Celtic became the first European club to win the treble in the 1966-67, when they clinched the Scottish League, Scottish Cup, and what was then the European Cup. Credit: Twitter/@RareTega
Ajax was the second to achieve this feat, winning the Eredivisie, KNVB Cup, European Cup in the 1971-72 season. During this season Ajax lost just one game, remaining otherwise undefeated in domestic and European competitions. Credit: Wikimedia Commons
Another Dutch club, PSV, replicated this feat in their 1987-88 season. Credit: Wikimedia Commons
Alex Ferguson became Sir Alex Ferguson when Manchester United, under his management, became the first English club to win the treble in the 1998-99 season, managing to win the Premier League, FA Cup, and Champions League. Credit: Wikimedia Commons
Inter Milan, under Jose Mourinho, managed to win the treble in the 2009-10 season, sealing the deal with Serie A, Coppa Italia, Champions League victories. Credit: Youtube/UEFA
Bayern Munich is one of two clubs to have won the treble twice. They won it first in the 2012-2013 season, with victories in the Bundesliga, DFB-Pokal, and Champions League. Credit: Twitter/@TheLucasLad
They did it again in the 2019-2020 season. Apart from the treble, Bayern went on to win all six competitions in the 2020 calendar year, including the DFL-Supercup, UEFA Super Cup, and FIFA Club World Cup. Credit: Reuters Photo
The other team that managed to win the treble twice has been magical Barcelona. Under Pep Guardiola in his first season as manager, Barcelona became the first Spanish side to win the treble, clinching victories in La Liga, Copa del Rey, and the Champions League in the 2008-2009 season. Credit: Wikimedia Commons
Barcelona in 2014-2015 was a fearsome prospect with the attacking trio of Lionel Messi, Luis Suarez, and Neymar giving opposition defenders all sorts of trouble. Under Luis Enrique, the Spanish club won its second continental treble this season. Credit: Wikimedia Commons
Pep Guardiola recreated his Barcelona feat with Manchester City, after many a frustration in the European competition since he took charge of the English side. However, this time it was nigh inevitable, as City won the EPL making the most of Arsenal's last-minute fumbles following a great season. A resurgent Manchester United were not enough to stop Pep's juggernaut from claiming the FA Cup, and Inter despite their best efforts, conceded a goal from Rodri, to give City the treble. Credit: Reuters Photo