#2 Joao Felix's untimely injury
Joao Felix was made the most expensive player in Atletico Madrid's history when he was bought for the princely sum of €126m and despite still being a teenager, big things are expected of him.
His start to life in Spain has been less than stellar, but the Portuguese international has still starred with three goals and one assist from 11 matches in all competitions.
Against Valencia, he was deployed on the right of a midfield four and despite having minimal impact on the game, his presence on the field still kept the Valencia defence on the back foot.
However, with 10 minutes left in the fixture, the 19-year-old pulled up with what appeared to be a twisted ankle and was deemed unfit to continue the game.
This put Atletico Madrid in the rather dicey situation of having to see out the remainder of the match with just 10 men, as Diego Simeone had already made use of his three allotted substitutions.
Valencia promptly made their one-man advantage count in the immediate aftermath, with Dani Parejo equalising with a well-taken free-kick.
Though parity was restored with Lee-Kang's late red card for a rash challenge on Santiago Arias, it was too late for Atletico to spring any last-minute surprises and they were made to count the cost of an unfortunate injury to their Portuguese star.