Birmingham boss Steve Bruce hit out at a section of the fans that booed his substitutions during his side's 1-0 victory over Stoke.
The win took them back into second in the league and Bruce said: "We have won the game and gone second in the league with two games in hand.
"But it is still not good enough for some of our supporters. What I have witnessed has saddened me a little bit.
"We have got a lot of young lads and they need help not booing and jeering."