"It has been a privilege and a great sporting challenge to work with Lewis, and the harmony in our relationship played a big part in the constructors' championships we won as teammates. Later this year, the time will come to say goodbye -that's not for now, but I would like to thank Toto and the team for the respect in how we took the decision together.
"I am really pleased to have chosen my new challenge with Alfa Romeo, an exciting and iconic manufacturer, and by the opportunity to help lead the team forward up the grid. I'm as hungry as ever to race for results and when the time comes, for wins. But for now, my mission is clear: maximum attack for Mercedes, all the way to the final lap in Abu Dhabi."