The boys played out an entertaining 2-2 draw with Southampton on Tuesday evening.
Jose Fonte's header put the Saints ahead but two quick-fire goals from Olivier and Santi at the start of the second half sent Arsenal ahead.
But Adam Lallana equalised moments later and the Gunners had to hold on for a point after Mathieu was sent off.
Click the play button above to watch a short clip of the game.Copyright 2017 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source