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.

Established teams like Real Madrid, Manchester City , and Bayern Munich displaying signs of challenges, big clubs are slowly adapting to the new UEFA Champions League structure. These world-class teams are having trouble consistency and performance in the ongoing UEFA Champions League season.

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.