The Italy international spent four months with the Hammers on loan from Serie A club AC Milan, making ten Barclays Premier League appearances and impressing with his technique, work-rate and commitment.
"Now the season has finished and my loan has ended, I would like to make a personal message to the fans and to everyone who works at the Club to say 'Thank you' to everybody for the splendid four months I have spent here," he told whufc.com.
"I was really happy and settled at West Ham and in London and I got to know some great people.
"Above all, I have had the honour of playing for a historic English Premier League club."
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