The striker, who joined from Roma on Saturday, says he turned down a move to England in the summer and is excited to step up to the challenge of impressing in a foreign country
Borriello joined the Hammers on loan from Roma until the end of the season on Saturday as manager Sam Allardyce adds to a squad that is fighting relegation.
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"I was given the opportunity to move in the summer and I was looking to come over to England and the Premier League, but I decided to stay at Roma at that time," Borriello told the club's official website.
"However, when the opportunity arose to join West Ham in this transfer window, I was very happy to make the move.
"I can't wait to start playing in the Premier League - I know the fans are very passionate and I'm very excited by the challenge.
"I know it is a very tough league, but I am very much looking forward to testing myself here.
"Serie A and the Premier League are two different leagues. The Italian league is a bit more tactical, whereas the English league is maybe more physical.
"However, the ball is round in both countries, so if you are good player you can play in any league in the world."