Of the four possible opponents Real Madrid could have been drawn against on Monday, Atalanta were the most dangerous due to their unpredictability.
If other offensive sides can be studied for patterns of play, Gian Piero Gasperini's Nerazzurri are more like a bottle of Coca-Cola that has had a packet of Mentos tipped into it. They can fly off in any direction and leave destruction in their path.
Atalanta are a team built around attacking and nothing else. They've been Serie A's highest scoring team for the last two seasons and they were the Champions League's surprise package last season, getting to the quarter finals and only falling to two last-minute goals against Paris Saint-Germain.
Even though they've had their difficulties lately, their priority is always goals, and they won't be an easy opponent.
La Dea are currently facing internal problems though. Gasperini has had to manage a fallout with two of his best players in captain Papu Gomez and Josip Ilicic.
The Argentine No.10 hinted on Instagram on Monday morning that he might be on his way out of the club, after Gasperini had said on Monday that the club would decide what happened with the captain.
As a result, the side Real Madrid meet in the last 16 could be very different from the one who took Valencia apart at the same stage last season.
The two sides have never previously met.
Source: Marca / Rubén Jiménez