The Champions League has a reputation for being a competition where the biggest, richest clubs always prosper.
That's why we love it when that narrative is turned on its head or when clubs pull off a shock result.
We've seen so many David vs Goliath battles in Europe and on the rare occasion, it's David who comes out on top.
So talkSPORT.com has taken a look at some of the best unexpected results in Champions League history...
It was the first season in which non-champions were allowed to enter the competition, so Newcastle were really upsetting the apple cart by getting involved.
That feeling was heightened when they secured a shock victory over Barcelona at St James' Park thanks to a 49-minute hat-trick from Faustino Asprilla who ran the Catalan giants ragged.
Luis Enrique and Luis Figo did manage to salvage some late consolation but it was a night in which Europe's biggest clubs knew that they wouldn't always have it their own way anymore.
The Ukrainian side made it all the way to the Champions League semi-finals in 1999 and took some significant scalps along the way.
The biggest had to be a victory over reigning champions Madrid in the quarter-finals in which a fresh-faced Andriy Shevchenko wreaked havoc on the Spanish giants.
It was that summer in which the striker was snapped up by AC Milan and Kiev came to the realisation that this was probably the closest they'd get to Champions League glory.
Arguably the biggest upset in our list came in 2004.
Fresh from a 4-1 victory at the San Siro, the Italian giants were confident of progressing to the competition's semi-finals.
However, the Spanish side had other ideas as Walter Pandiani, Juan Carlos Valeron, Albert Luque and Gonzalo Fran scored a thumping win to silence the
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