"It feels good, it feels special", he said on West Ham's website. He's got to be ready for the challenge because the West Ham fans, if things aren't going well they can be pretty ferocious as we've seen this year. Not many clubs could fill it week in, week out, and West Ham do.
'It's well known that I come from a family of Hammers and it's a special moment to sign for the club I used to go and watch as a boy.
West Ham director of football Mario Husillos said both he and manager Pellegrini were eager to complete a deal for the midfielder.
Wilshere said there were various factors that influenced him to join the club.
"Jack is a player with vast experience and quality at the highest level, having played all of his career in the Premier League".
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Born in Hertfordshire, Wilshere grew up in a family of Irons supporters.
Antonio was restricted to 21 appearances in a stop-start season last time out, and United will consider offers upwards of £15m.
There were talks of him going to Turkey but Wilshere has chose to stay in the Premier League and sign a three year contract.
'The West Ham fans are some of the very best and I am looking forward to giving everything I have to helping the team to bring success to you all.