Draw away from St Andrews this afternoon, Bruce said: "I'm still in shock. We've given good accounts of ourselves against Chelsea in the past and played well when we lost 1-0 at home at the start of the season - but that's the past.
"But it's the best competition in the world as far as I am concerned and we will give it our best shot."
Birmingham beat leeds United 3-0 at the weekend, while the Blues laboured to a 3-1 victory at home to Scunthrope United.