Manager Arsene Wenger says goalkeeper Wojciech Szczesny should be grateful to Arsenal after signing for Juventus.
The Poland international joined the Serie A champions on Wednesday to continue his spell in the Serie A.
And he is expected to take over from Gianluigi Buffon when the Italy international retires at the end of the season.
"I think he is an Arsenal boy, an Arsenal man but we have so many top-class goalkeepers that we gave him a chance to remain in Italy," Wenger said.
"I think that it's very good for his future because he will certainly take over from Buffon and I believe as well that he will always be thankful to Arsenal because Arsenal was a big step in his career.
"If you look at the keepers we have educated, they are all doing well. We had of course Wojciech and now Emi Martinez coming out of our ranks.
"We have Matt Macey behind and all are doing very, very well."
