"When you get the opportunities [as a teenager] you have to grab it with both hands and he has done that," Walcott told Arsenal Player .
"He's shown what he can do in the Carling Cup games and the Champions League. He's got a good head, he wants to learn, and that's very important. He's very relaxed as well and that does him a big favour because he fits in well.
"Alex has definitely got the potential to be there [at Euro 2012]. I don't think I deserved to go to the World Cup in 2006 but I hadn't played any games in the Premier League while Alex has played in the Champions League. He knows he has a lot to learn but he is showing very good signs at this moment in time."