Bolton have had their approach for Leicester manager Gary Megson rejected by the Championship club.
Wanderers have already failed in their attempt to talk to Birmingham boss Steve Bruce and have also approached Real Sociedad about Chris Coleman, according to the former Fulham manager's adviser Alan Smith.
And now they are also interested in Megson, who took over at the Walkers Stadium from Martin Allen in August.
Mandaric said in a statement: "Following widespread speculation in the media regarding Bolton Wanderers' interest in our manager Gary Megson I can confirm the Premier League club approached us early yesterday morning seeking official permission to speak to Gary. That approach has been completely rejected.
"Such interest and continuing media speculation has inevitably had an unsettling influence and is neither invited or welcome.
"I have worked tirelessly to bring stability to this club and showed immense faith in Gary to bring him here after a sustained period out of the game.
"While interest from a Premier League club appears flattering and vindicates my decision to bring Gary to the Walkers Stadium he remains an integral part of my plans to bring top flight football back to this club.
"I am a great believer in loyalty, trust and integrity. Gary made a commitment to this football club, the supporters and myself and I fully expect him to honour that commitment.
"I therefore have no doubts in my own mind that Gary will reiterate his commitment when he talks publicly in the next 48 hours.
"It is also important to point out that contrary to claims today, Gary Megson has not spoken to Bolton Wanderers and furthermore is bound by a legally binding contract at Leicester City Football Club."