The Ibrox shareholder has thrown his weight behind moves that would see Paul Murray, Malcolm Murray, Scott Murdoch and Alex Wilson appointed to the board. And he confirmed former Liverpool managing director Christian Purslow is set to take on a chief executive role at Rangers in the event of a shake-up.
Mr McColl said: "If we can get a good, solid, professional board in there that is open to transparency and proper governance, we will get the support for additional funding through existing shareholders and institutional shareholders.
"Many of them have said that with a good and proper board in place, they will put more money up. Of course they would, because the potential for this club and the potential for them to make a good return on that money is really quite fantastic.
"There are people who have approached me, previous investors in Rangers before Charles Green came in, who are wealthy individuals in Scotland who have said 'We would love to put our money in, but we are not going to put it into Green'.
"We have spoken to Christian about the role of coming in and helping sort out on the CEO side. I think Christian is open to that and quite keen, but he first wants to see stability on the board"
While McColl confirmed he will not invest any of his personal wealth into Rangers, he is keen to work with Dave King.
King put £20m into Rangers during the Sir David Murray era and has held talks regarding another investment.
Mr McColl added: "Dave came to see me in my office on Friday and we had a good chat.
"Dave is independent in this but I would be supportive of Dave King.
"He is passionate about the club and I believe he would be a good person to be involved in it."
Earlier, Rangers launched a fresh appeal for a new chief executive to replace Craig Mather by posting an advert which said the club was looking for "an exceptional business leader" who could "drive the club back to the pinnacle of Scottish and International sport".