Birmingham chief Peter Pannu insists that the club will not be giving Alex McLeish permission to talk to any clubs.
McLeish quit the Second City outfit on Sunday, via email, and is now believed to be in contention to take charge at arch-rivals Aston Villa.
But acting chairman Pannu says the club will try and block efforts, as they have been left angered by McLeish's departure.
"To get an email when I am on business in Amsterdam speaks volumes," said Pannu.
"We have spent £40m and supported him all the way and what we get is a relegation and a snub."
Deals in place
Pannu insists they were totally behind McLeish, and offered the example that they have agreed deals for four new players this summer.
Marlon King and Chris Burke have both signed, whilst deals for Dutch star Danny Koevermans and Dundee United's Morgaro Gomis were also in place.
"Carson (Yeung, Birmingham owner) gave him unwavering support and did not sack him and declared his job secure and professed trust and confidence in him," he continued.
"So much so that we have just negotiated for four of his new first-choice players. I won't blame any outside clubs yet until I find out more.
"He is still our contracted staff and Birmingham City does not grant him any right to speak to any outsiders until the matter is resolved.
"I will be meeting my legal team and rest assured I will leave no stones unturned.
"It's about time some discipline is instilled into this game and I am unfortunately not a person who gets pushed about."