Wilshere is regarded as one of the hottest prospects in English football after a series of fantastic performances this season, and earned his first England cap against Hungary in August 2010.
Capello admits he has been impressed with Wilshere’s development and believes that the midfielder plays with experience beyond his years.
“Wilshere will start tomorrow. He is one of the young players that improved more in a really short time,” Capello told reporters.
“When he started he was a young player, an interesting player, when he played the first game with us he played 15 minutes at Wembley, he was good but he was young.
“Now he is playing like a player that has played a lot of games, like a player of 28-29-years-old.”
Wilshere received particular praise for his performances against Barcelona in the Champions League, and Capello has revealed he has been surprised by how quickly Wilshere has progressed this season.
The Italian added: “The games he played against Barcelona, he was fantastic. He played with personality and without fear and he’s a leader out on the pitch.
“It’s not easy to find a player like him who plays without fear in the Camp Nou. I spoke with Arsene Wenger two days ago and he told me the same and he was also surprised how well Wilshere has improved with his leadership.”
England could top Group G should they triumph at the Millennium stadium.
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Fabio Capello: Jack Wilshere Will Start Against Wales