Facing old boss Roberto di Matteo proved no distraction, as the Blues raced into a lead in Gelsenkirchen.
After going 3-0 up, the club couldn't but help take a dig at rivals Arsenal, via their Twitter feed.
Chelsea FC (@chelseafc) November 25, 2014
Arsenal's last game in the Champions League ended in humiliation, after their 3-0 advantage over Anderlecht was eradicated by the Belgians, who came back to draw 3-3.
With Chelsea's almost impenetrable defence under Mourinho, the club were clearly confident of avoiding the same fate. There is no love lost between the Chelsea boss and Arsene Wenger, and that clearly translates throughout the club.