Ahead of their Carling Cup tie, Bruce said: "I can't understand the decision to sack Big Ben (Gunn).
"It's ridiculous. Why let him go and bring in 12 players if he is not the man for the job?
"He had a setback - and let's be fair, we've all taken a hiding in our time - but to get the sack on the back of it seems a bit knee-jerk to me. I hope Big Ben is all right because he has been there for something like 22-23 years in different roles and it seems to have gone out of the window with that decision.
"Had they done it in the summer, that's one thing. But they obviously felt he was the man, then one horrible defeat has changed everything."