He has been with the Gunners for many years, joining the academy at the age of nine.
I'm delighted to have finally got to this stage after all the hard work over so many years," he said to club media.
It's a proud moment for me and my family to finally be here, so I'm happy and ready to keep working.
It was the dream to get to this stage. I've always thought about when this day would come and I've been looking forward to it, so I'm happy it's finally here. I didn't have to think about it - this is my family and it feels like home here. Everyone's like a family together and they care about everyone. It feels so special to me here.
"All the people around me have helped me get better as a person, and definitely helped me develop as a player on the pitch. The opportunities from Mikel, all the under-21 coaches, under-18s coaches - they've all helped me develop so I'm grateful to them."