"He's a really nice lad," Walcott told Arsenal's official matchday programme. "For a little lad he's very strong, he's got a good left foot and his link-up play and reading of the game is fantastic.
"He makes it look so easy when he plays and every time he gets the ball and does something he brings a smile to your face."
Walcott added: "I'm sure he'll get a chance or two this season, he's still young so he'll want to play, but he will need rest as well.
"It's nice to have another English face in the changing room though, especially after Justin [Hoyte] left. I was sad to see Justin go, but with Jack and Aaron Ramsey here too, there are a few Brits in the squad."