David Sullivan will be supporting Birmingham against West Ham at the weekend as he hopes that his old club can continue to benefit from his efforts.
The announcement comes at a time when reports suggest the 60-year-old has joined forces with fellow former Blues co-owner David Gold to table a £42million bid for the Hammers.
Birmingham, now under the ownership of Carson Yeung following the Hong Kong businessman's £80m buyout of Sullivan and Gold, host West Ham on Saturday with the home side in a rich vein of form.
Alex McLeish's side are unbeaten in six games and there have been whispers of Europa League qualification, while Gianfranco Zola's contrasting strugglers sit 17th in the Premier League.
Sullivan hopes that Birmingham can again avoid a defeat when West Ham visit St Andrews, despite rumours that his bid for the London club has been submitted with proposed options of either a complete takeover or 50 per cent shareholding.
"I would be very surprised if Birmingham don't win at the weekend," said Sullivan in the Daily Mirror.
"To go six games undefeated and win three in a row is amazing and it is wonderful to think they are playing a team like West Ham and Birmingham will be the odds-on favourites.
"I will be supporting Birmingham because it is the team we left behind and we want that team to show people we left behind a fantastic team.
"The legacy we left was a good one and I am so pleased the team are doing so well for the manager, the new owners and the supporters."
Birmingham's recent success has been built upon a three-pronged attack and Sullivan believes the tactical reshuffle has silenced McLeish's critics.
"The minute the team switched formation they have been performing fantastically well," added Sullivan.
"Alex made some fantastic signings and it is a great mix there - plus (Christian) Benitez is a world-class player I left behind.
"I think any doubts anyone has ever had about Alex's abilities as manager have been removed by the performance of the team this season."