Just as the game looked to be heading for a draw, Tarkowski was penalised for a push on Ramsey in the box, which after seeing replays, looked harsh on the Burnley man.
Nevertheless, Sanchez stepped up and kept his composure to secure the win for the Gunners.
Check out the goal for yourself here:
Alexis Sanchez for the win. Last minute penalty. 1-0
— WengerMindset (@WengerMindset) 26 de novembro de 2017
pic.twitter.com/UQmGudkIgM