The Gunners boss has praised the Frenchman's development since signing in 2010.
The France international joined the Gunners from Ligue 1 side Lorient in 2010, but was a relative unknown at that point.
He has however developed into one of the Premier League’s best defenders over the years, and is a mainstay in the Arsenal defence. Now, his boss has praised his development at the club, saying his growth in stature has been “really satisfying” for him personally.
“He had a lack of experience when he came here,” he said.
“Now he’s getting stature. He has pace, technique, understanding of the game and intelligence, as well as the needed confidence to play. Because he started late in his career, he had to gain that experience of being responsible.”
If anyone has a pedigree for developing young talent it is Wenger. The Frenchman has developed a number of top players from a young age during his time at the club, with Cesc Fabregas the most obvious player of note.
In fact, it has been the policy of the club for some time to buy youth and develop it rather than spending large sums of money on established players, although that has changed in recent seasons.
And for Wenger, the fact that Koscielny was such an unknown before his time with the Gunners makes his development at the club all the sweeter.
“It’s really satisfying to see him fulfill his potential because he’s a player I bought from Lorient,” he added.
“When you listen to people, you always get names that everybody knows. Sometimes it’s rewarding to find people who have the quality to play for our club but are not necessarily the names that everybody else is after.”