Tuesday will be remembered mostly as a day of upsets in the UEFA Champions League as Real Madrid and Manchester City — Europe's two most recent title holders — both suffered lopsided defeats.

Matchday four of the Champions League saw the two of the most successful sides in the competition facing off, as well as a former Liverpool legend returning to Anfield. Real Madrid hosted AC Milan in a bid to recover after a poor start to the season by their lofty standards,

The Leverkusen coach was given a warm welcome on his return to the club where he became a fan favorite as a player over five seasons between 2004-09. Alonso won the Champions League with Liverpool in 2005.