Firstly I would like to thank everyone at FC Barcelona where I enjoyed three wonderful years. It was my childhood club and I will always be proud and honoured that I had a chance to play for such a great team.
I do feel that I have unfinished business in the Premier League and now is the right time to return.
I considered all the other offers very carefully and I firmly believe that Chelsea is the best choice.
They match my footballing ambitions with their hunger and desire to win trophies. They have an amazing squad of players and an incredible manager.
I am fully committed to this team and I can't wait to start playing.'
More top news
The mayor claimed last week the bridge would cost more to cancel than to build. He said £37.7m of public money had already been spent.
The houseboat in Chelsea, west London, comes complete with three bedrooms, three bathrooms, a reception room and its own patio.
The city is one of a small number which has seen an increase in traces of the Class A substance over recent years.