French teenager joined Arsenal from Ligue 2 side Lorient for a fee of around £7 million that will keep him in the club for five years.
The midfielder has become Arsenal’s fifth summer signing following the arrival of Lucas Torreira from Sampdoria (£26.5m).
Guendouzi will be an ‘important part of the first-team squad’ according to Emery, with the 19-year-old expected to feature prominently in the club’s cup campaigns in 2018/19.
After joining Arsenal Guendouzi has given an interview: "It’s something I’m immensely proud of. Arsenal have always been the team closest to my heart and a side I’ve wanted to join since I was a child. It gives me great pride – it’s incredible.
"I hope I can do great things here. It doesn’t get any better than coming to a club like this, with so much history, like Arsenal. I’m hugely proud.
"My hope is to become a top player here at Arsenal. A lot of great players have played here. I want to become part of the club’s history and to achieve great things here.
] "I want to win titles, titles, titles. I want to establish myself here, which would be amazing. Winning silverware, as I said, is very important to me and winning things here at Arsenal would be incredible."