Leicester's fairytale story took on a European dimension on Tuesday night as they knocked out Sevilla to reach the Champions League quarter-finals.
Here, we take a look at five other clubs to have shaken up the Champions League.
APOEL: Quarter-finals, 2011-12
APOEL had to come through two qualifying rounds just to reach the group stages but they ended up in the quarter-finals facing Cristiano Ronaldo and Jose Mourinho's Real Madrid. The Cypriot side made the knock-out stage for the only time in their history following victories over Porto and Zenit St Petersburg before dumping out Lyon in the last 16. Madrid, however, finally proved a step too far as APOEL's fairytale run ended in an 8-2 aggregate defeat.
Porto: Champions, 2003-04
Porto were not so much minnows, having won the European Cup in 1987, as sleeping giants, given they had only once gone past the quarter-finals of the continent's premier tournament in the 17 years since. Enter a young Mourinho, who raced down the touchline as his team knocked out Manchester United in the last 16, before beating Lyon, Deportivo and Monaco to win the title. They were the first club outside the four major leagues to do so since 1993.
Deportivo: Semi-finals, 2003-04
Deportivo were powerless to prevent Porto's progress but their run to the semi-finals was almost as surprising. The Spanish outfit upset Juventus in the last 16 but their zenith came in the quarter-finals against reigning champions AC Milan. They were thrashed 4-1 in the first leg, with Kaka scoring twice at the San Siro, but pulled off a stunning turnaround in the second, winning 4-0 to go through 5-4 on aggregate. It remains Deportivo's only appearance in the competition's semi-finals.
Bayer Leverkusen: Final, 2001-02
Only once before in their history had Leverkusen appeared in the knock-out stages of the Champions League or European Cup but in 2002, it took a fabulous Zinedine Zidane volley to stop them becoming champions. Leverkusen finished top of their group, ahead of Arsenal and Juventus, before seeing off two more English teams - Liverpool and Manchester United - en route to the final. There Real Madrid, and Zidane, showed their class in a 2-1 victory that finally brought Leverkusen's brilliant tournament to an end.
Dynamo Kiev: Semi-finals, 1998-99
Kiev had not reached the last four of Europe's premier club tournament since 1987 but - inspired by the demon attacking duo of Andriy Shevchenko and Sergei Rebrov - the Ukrainian side ousted Arsenal to win Group E before inflicting a shock defeat over Real Madrid in the quarter-finals. Shevchenko scored twice in a 3-1 aggregate victory over Los Blancos but they lost to Bayern Munich in the semis and in the summer, Shevchenko left for AC Milan.