Assistant manager Neil McDonald believes Blackburn Rovers can cause a major shock by beating Chelsea and reaching the last four of the Carling Cup.
McDonald, who will take charge of Rovers for a fourth time while Sam Allardyce continues his recovery from heart surgery, is untroubled by Chelsea's current blistering run of form.
He said:"We've worked extremely hard to get to this point, so why should we say that just because we're facing Chelsea that's us out?
"We have to remain positive. Our home form is good and we'll have a right go at them.
"It'll be fantastic if the crowd is bigger than what it normally is for a Carling Cup game, knowing that we're playing a very good team in Chelsea. I hope it inspires the players to run even further and try even harder.
"It's a game of football, it's 11 versus 11. It's a long way to come on a cold Lancashire night and we have to try and use that to our advantage if we possibly can."
Of Allardyce's recovery, McDonald added:"He's been in a good mood. He's taking tablets and stuff like that and has been on the road to recovery.
"He's feeling better than before the op, which is great, and he's just waiting for the right time to come back.
"That probably won't be until Thursday or Friday, but he's very happy with his recovery and feels very comfortable.
"He isn't coming to the game. He'll be the first person I talk to after the game – unless the wife phones! He usually texts me to say well done and asks me to give him a call when I can."