Chelsea boss Roberto di Matteo says their spending spree is proof of the ambition of own Roman Abramovich.

Abramovich is determined to challenge Manchester City at the top of the Barclays Premier League this season.

Di Matteo said: "Roman's will to win has never decreased at any moment. He wants to win and he backs it up.

"Our aim, or ambition, is to challenge for trophies at the end of the season. We are going to be in competitions that are new to us, but we have to do better than finish sixth in the Premier League."