Arsenal have signed teenage midfielder Krystian Bielik from Legia Warsaw for a reported £2.4m. The Gunners say the deal "is subject to the completion of regulatory processes".
The Poland Under-17 international can play in both a holding midfield role and at centre-back.
He said: "I've decided to move to Arsenal and although I cannot be sure of what's to come in the future, I'm going to London to fulfil my dreams.
"I'm grateful to my team-mates and manager Henning Berg for trusting such a young player and giving me a chance to play for the first team. It's mostly thanks to him that I'm able to move to Arsenal."
Berg said: "Krystian is a very talented player, who is going to achieve big success in football in the future."
