Arsene Wenger is convinced by the quality of new signing Rob Holding.
The defender joined Arsenal last week from Bolton Wanderers.
“[We chose to take him from Bolton] because of his quality,” the manager said.
“He’s a young, promising centre back. You don’t find centre backs that often and we can educate them when they’re at that age.
“We can give them all the ingredients we think are important.”
On Polish youngster Krystian Bielik, Wenger added: “Krystian Bielik is developing well now and he can also be used as a central midfielder, so overall it’s an opportunity I wanted to take because that’s a difficult position to find nowadays.”