The Northern Ireland international is keen to push the Canaries back into the Premier League after agreeing a three-year deal to begin upon the expiry of his contract in Italy
The Northern Ireland striker will join the Canaries on July 1 after agreeing a three-year deal with the Championship club.
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He told the club's official website: "Norwich is a team that wants to get promoted back to the Premier League at the first opportunity so I'm excited to come here and start playing football for a team like this.
"I've played in the Championship before and I've played against Norwich and things I noticed about the club were the fans and the football they played.
"Speaking to the gaffer [Neil Adams], everything he said and everything he wants me to do, it's good to have someone like that believing in me.
"I can't wait to get started."