Speaking in The Independent Birch said: "It's tough because it's a hard market out there. Football is going through a difficult period and therefore there aren't people queuing up to snap your hand off. So it has to be something that's in your blood. You are looking for somebody with an emotional aspect to the investment.
"If you are looking for a normal return then you are not going to look at football, save for Manchester United. But I do think there will be a solution. I'm confident that there will be somebody out there who wants to buy Leeds United.
"We are a Premier League club, with the potential to be a top Premier League club, and we are a one-club city.
"It has a large catchment area; it is the second city to London in terms of finance and banking and it's an affluent area. You then add the residue of a reasonable team with some good, young players coming through. So I am confident something will happen.
"As for investment, it depends on the strength of the buyer coming in. Anybody looking at the club has got one eye on some investment in the transfer window and you would assume it would be done through their own resources.
"They will factor that in to the amount of money they are prepared to pay for the club, and therefore there will be an element of cash available, or earmarked for the transfer window."