His side were hammered 5-1 at Bayern Munich in the first leg of their Champions League round of 16 tie.
Arjen Robben and Alexis Sanchez traded goals in the first half, but goals from Robert Lewandowski, Thomas Muler and a brace from Thiago capped a superb second half for the home side.
Arsenal manager Arsene Wenger told BT Sports after the game that Bayern deserved the comfortable win.
In last night's other last 16 match, Real Madrid beat Napoli 3-1. Lorenzo Insigne put the visitors 1-nil ahead, before a Karim Benzema header levelled proceedings.
Toni Kroos put Madrid in front early in the second half, before an incredible strike from Casemiro put two goals between the sides ahead of the second leg.
