Thomas Vermaelen is impressed by the new players which have been introduced to the Arsenal first team this season.
"Laurent has done really well in his first Premier League season," Vermaelen told the Official Arsenal Matchday Programme.
"The French league is a good one, and he knew how to face strong teams like Lyon, Marseille and Bordeaux, but it's a step up to come to the Premier League and he's handled it well.
"There is always talk about Arsenal's back four, but defending is about teamwork as well as individuals and goals are often down to a number of things rather than defenders' mistakes.
"Jack has done really well too - he has a great future in front of him, as does Wojciech. Both of them have a really good mentality and don't feel pressure.
"You can see that on the pitch - they play like they might do in the garden and that's a great quality for a footballer, not to have stress when playing.
"I saw at first hand when I played for the reserves that we have a lot of great young talents here, and it's brilliant that these two guys have pushed on so well."