Following the case at Cardiff Crown Court, Woodhouse joined up with the team at their hotel in Scotland on Tueday night and met face-to-face with Bruce.
"I have known Curtis for some time, he played for me as a kid at Sheffield United and he can be a lovely lad," said the Blues boss.
"But he has had a warning that I will not tolerate him getting into any more trouble.
"Let's be brutally honest, he's been given a reprieve by the judge. He could so easily be sitting in a jail cell today instead of preparing with us.
"It's time Curtis grew up a little and if he does then we still might be able to rescue him.
"If not? Well, how often have we seen footballers go off the rails and throw away their talent?
"He's not a youngster any more and he has to wave goodbye to his past and conduct himself properly.
"The Birmingham punters haven't seen the best of Curtis Woodhouse. He has got plenty of talent but that talent will only emerge if he stops getting into trouble and concentrates on his football."
"I sincerely hope that he realises just how serious the situation was.
"Myself and the club will give Curtis help and every opportunity he needs to start afresh but, ultimately, it is down to him.
Woodhouse returned to action in the 2-1 friendly defeat against Motherwell on Wednesday night but limped off after 41 minutes when he turned his ankle.