Arsenal have completed a £25 million deal for Celtic defender Kieran Tierney, with the left-back signing a five-year deal at the Emirates.
The 22-year-old is regarded as one of Britain's brightest young talents having made his Celtic debut as a 17-year-old back in April 2015.
He has since gone on to make 171 appearances for the reigning Scottish champions, scoring eight goals and making 37 assists.
The defender completed a medical at London Colney on Thursday and will immediately join-up with his new team mates. He will wear the No 3 shirt.