Chelsea's David Luiz signs new five-year contract with the club

• 'I want to play for a long time at top level,' says Brazilian• Roberto Di Matteo confident over Ashley Cole contract talksDavid Luiz has signed a new five-year deal with Chelsea, while Roberto Di Matteo has said he is confident that contract negotiations with the full-back Ashley Cole will also reach a successful conclusion."I am very happy," David Luiz told the club's website. "I want to play for a long time at the top level – which is what playing for Chelsea means. I love...