Krystian Bielik is a “huge talent” who has shown "positive signs" in training, according to Arsène Wenger.
The teenage midfielder joined Arsenal from Legia Warsaw on Wednesday and has represented Poland at under-17 level.
Wenger confirmed Bielik will not play for at least three weeks but he believes he has the potential to make his mark on the first team.
The first signs that we see are very positive in trainingArsène Wenger
"I would say, considering his age, he’s more one for the future," the manager told Arsenal Player.
"But let’s be open minded and let [him] surprise us. The first signs that we see are very positive in training.
"Because they had the winter break in Poland, we are just at the starting point of building him up fitness-wise.
"He’s a young boy and he has a huge talent."Copyright 2016 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source