Birmingham manager Alex McLeish believes his side can pile more misery on Chelsea when they meet on Saturday.
The Londoners travel to St Andrews in the Premier League having lost two of their last three games, most recently a 3-0 humbling against Sunderland.
McLeish believes the Black Cats defeat may result in the champions coming out fighting at the weekend, but he has confidence in his team at home.
"I don't know if Sunderland have done us any favours, put it that way," he said.
"Having said that, we're at home and we think we can be a match for anybody at home.
"We were a match for Chelsea last year. Chucho Benitez scored a goal (in a 0-0 draw) which was adjudged offside but the replays showed it should have been allowed.
"For Chelsea to lose three games (in quick succession) - it's very rare for one of the big teams to do that.
"But it's achievable. We can (win), I'm not saying we will, but we can definitely at St Andrews, if we play to our highest level and the fans get behind us."
Carlo Ancelotti's side will continue to be without central defenders John Terry and Alex at Birmingham, but McLeish joked that they will still be a force.
He remarked: "I'd prefer it if they had more defensive problems - if maybe (Petr) Cech was out as well."