Arsene Wenger
Arsenal manager Arsene Wenger set to secure Legia Warsaw youth star Krystian BielikGetty

Arsenal are on the verge of completing their first signing of the January transfer window, having agreed terms with Legia Warsaw for Krystian Bielik.

The 17-year-old defensive midfielder has already revealed he was likely to join the Gunners after spending time on trial at the club's London Colney training ground in November.

Arsenal manager Arsene Wenger has reportedly earmarked the coveted teenager as the long-term replacement for Mikel Arteta, whose contract at the Emirates Stadium is due to expire in the summer.

Bielik confirmed the French boss plans to place him in the Under-21 side, with the view of moving straight into the first time should he impress.

"He said clearly that I could move to the Under-21s if I want to but, at the same time, he pointed out that he believes in me. I'll be training with the first team and get a chance to play, if I adapt myself," Bielik said.

"I believe him, because I know that is not afraid to try with the young."

Arsenal have since been in negotiations with Legia to complete his services during the January transfer window.

Recent reports claimed Legia had rejected two offers from the Gunners, demanding around £3m for his services.

But Polish newspaper Przeglad Sportowy has reported that after a meeting on Tuesday 13 January between Arsenal and Legia officials, the Gunners increased the offer and both clubs reached an agreement.

Now the Gunners need to reach an agreement with Bielik to close the deal.

Przeglad Sportowy also revealed Bundesliga giants Hamburg are trying to tempt the youngster into a move to Germany but with Bielik confirming his desire to move to the Emirates Stadium, the deal to make him an Arsenal player could be done before the end of the week.