The 20 year-old ex Charlton player scored on his debut for Arsenal against Blackburn Rovers, he also contributed immensely to the Gunners 1-0 win over West Brom.
He tweeted excitedly, "Delighted to announce that I have officially signed for @Arsenal FC. Can't wait to see what the next two seasons here have in store for me. Thank you everyone for the messages wishing me well on my move to Arsenal I've been overwhelmed by the amount and I'm truly grateful".