The deal was agreed in principle back in May, but a four-year contract with the Barclays Premier League was not ratified until Sunday.
"It´s been a long time coming," the 26-year-old told his new club´s website. "It was probably the worst-kept secret in football, but it´s great to be here. I think it´s great to finally reach a positive conclusion - especially after all the time and energy that´s been put in from everyone involved!"
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