The Hong Kong businessman commented to the press for the first time since completing his £81.5million takeover of the club just over a week ago.
Yeung has now pledged a lot of money for Blues boss Alex McLeish to spend in the January transfer window.
He said: “I will talk to Alex about his needs first. My first plan is to support the club with 20million to 40million pounds.”
He added: “I will be supporting the manager. We have an excellent management team.
“Our aim is to work hard to secure our position in the Premier League, not only for this year but for many years to come.
“Birmingham can become as big as possible. We are competitors for Aston Villa.
“In the short term I just care about January. But in the future there will be more money, and longer term we believe there is a major opportunity to build Birmingham’s fan base in China and to generate new sources of revenue for the club.
“But for this to happen, our first priority must be to establish Birmingham as a Premier League club.”
