The boys were held to a frustrating 2-2 draw by Swansea City at Emirates Stadium on Tuesday.
The visitors took the lead on 11 minutes when Wilfried Bony powered a header past Wojciech but the Gunners hit back with two quick fire goals in the second half from Lukas and Olivier.
But in the 90th minute the ball cannoned off Mathieu and into an empty net after Leon Britton broke through on goal.
You can watch a bitesize cut of the game by clicking the play button above.Copyright 2015 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 26 Mar 2014