Olympiacos striker Darko Kovacevic says they're convinced they can shock Chelsea this week at Stamford Bridge.
He said: "In Athens, we deserved more. The 0-0 was not fair but we can't change the result.
"They don't dominate their rivals any more and that is costing them a lot of games. We have seen the video of the Carling Cup and Tottenham have shown us the way that we should play in London.
"We are not worried about the atmosphere at Stamford Bridge - it is nothing compared to derby matches in Athens.
"All the pressure is with Chelsea and that is good for us. We will be happy the longer it stays 0-0 because our chances of winning will increase.
"Half of Europe is waiting for how this game turns out - it could be a surprise."