Arsenal have completed the signing of teenage midfielder Krystian Bielik from Legia Warsaw for an undisclosed fee.
The versatile Poland youth international, who can play in holding midfield and at centre-back, has made just six first-team appearances for Legia in his inaugural season as a professional.
Wenger said: “He’s a defensive midfielder, he is 6ft 2ins, he has a good energy level and a good technical level. Is £2m a lot of money? It is less than that but yes, it is a lot of money for a player if he doesn’t succeed. If he does succeed, it’s cheap.
“Of course, it’s a gamble. But on what we saw, it’s a gamble worth taking.”
Warsaw manager Henning Berg told Sky Sports News HQ that Bielik is an exceptional prospect.
“He’s a physical player with good skills,” he said. “He has very good understanding of the game and match mentality. Krystian is quite far ahead of other players at his age.”