The 24-year-old, who made just seven starts in his eight years working under Arsene Wenger, said: "I left Arsenal to be part of the starting XI and playing every week. It is great for me and I've never been so happy.
"Results have been up and down and we have got to improve but I just love playing. When you are not playing at Arsenal you're always waiting for your turn.
"I just keep working hard but my confidence went a bit because I wasn't playing enough.
"Training was great and Arsene Wenger always believed in me but when you get in new players you have to make a decision.