London: Arsenal on Wednesday confirmed the signing of teenage midfielder Krystian Bielik from Polish side Legia Warsaw.
The transfer of the promising 17-year-old was posted on the official Arsenal website, with a fee in the region of £2.5million ($3.8million, 3.3 million euros) said to have been agreed.
The Poland youth international is expected to work initially within the Gunners` Under-21s side, but then the aim would be for him to swiftly progress through to the senior squad.
A statement from Arsenal read: "Arsenal have completed the signing of 17-year-old midfielder Krystian Bielik from Legia Warsaw for an undisclosed fee."
Bielik, who made his senior debut for Legia at the age of 16, has made six appearances for the club, and can play in both midfield and defence.
Arsenal won 2-0 at Manchester City on Sunday to close back up on the top four of the Premier League and manager Arsene Wenger is determined to secure some more defensive cover in the January transfer window.