Brazilian defender Alex has completed his protracted move to Chelsea.
Alex, who represented Brazil at this summer's Copa America, told Chelsea TV: "I hope to start very soon and to do a good job at this wonderful club.
"I am happy for the opportunity Chelsea have given me. It's a wonderful club, I sometimes watch the games and I hear about the club and I hope everything goes well.
"I hope to adapt myself very quickly because Carvalho and (manager Jose) Mourinho will help me with the language barrier, and I hope I can start straight away and won't have any problem to be on the team."
Chelsea chief executive Peter Kenyon feels the club now have genuine strength in depth at the back, having had to resort to playing Michael Essien and Paulo Ferreira in central defence because of injuries last season.
"It seems like a long time coming. We had it agreed a long time ago," he said.
"As you can see he has kept fit over the summer and he is a good addition to the squad. He has got to be our biggest player (in terms of height) and he could be quite intimidating.
"Last season we lost out I think, there was that crucial period where we had those injuries around there. I think we've definitely strengthened in that position. We're very well covered and with very good quality as well."