Costa promises to boost Blues
Striker Diego Costa has vowed to do his utmost to deliver trophies for Chelsea.
Jose Mourinho's Chelsea are chasing a first Barclays Premier League crown since 2010 when the new season kicks off next month.
Costa carries a heavy burden, with Mourinho bemoaning his strikers last term and Chelsea's forward recruits having a history of struggling to make a prolonged impression, Didier Drogba aside.
Costa told Chelsea TV: "I'd say to the fans that you need to be confident that I personally will fight for this club to make sure we are in contention to win as many trophies as possible
"I'm part of a great group here of players and we will do everything we can to give the fans what they want - and that's titles."
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