Gary Cahill feels he still has plenty to prove following his £7 million January move from Bolton to Chelsea.
The England defender made his debut for the Blues against Manchester United on Sunday, and was unable to prevent his new side squandering a three-goal lead.
Cahill came to Stamford Bridge with a burgeoning reputation and, in recent months, has started to make his mark on the international stage.
However, the 26-year-old has no experience of playing in the Champions League and will face a supreme test when Chelsea meet Napoli in the last 16 of the competition later this month.
Cahill realises his credentials will come under close examination in the continents's premier club competition, but is confident he possesses the ability to make an impact on the European stage.
"I still feel I've got a lot of things to prove, I've played international football and I've played in Europe but I haven't played in the Champions League yet," Cahill told the official Chelsea magazine.
"So I think there are things that I need to prove, to myself mainly, but also to other people, that I can step up and make this jump.
"I think that will drive me on to do well, because I want to go out there and prove that I can play at this level.
"I've been looking forward to making the move and I'm glad it's happened so I can just look forward to playing and winning football matches."
Meanwhile, Chelsea duo Didier Drogba and Salomon Kalou helped the Ivory Coast progress into the final of the Africa Cup of Nations with victory over Mali on Wednesday night.
The Elephants beat Mali 1-0 to set up a clash with Zambia in Sunday's showpiece.