Rosicky backed his 18-year-old club-mate to shine for the Three Lions at the Euros and insists he will not be fazed by his lack of big-game experience.
Czech Republic skipper Rosicky, 31, said: "Of course I'm excited to see him getting his chance.
"For a boy his age it's vital to get experience like that. So Arsenal can profit from that.
"He's not the finished article, he has lots to learn but he is an amazing prospect and I just hope that he will work and he will grow.
"As I know him, he has both feet on earth and he's very confident.
"Even if you are like that, a tournament hits you anyway a little bit but that's what you expect.
"He's a very young boy and it's great that he's here and he can gain experience like that."