Fans gave a muted response to the directors' announcement that they would welcome Frank Blin, a former executive chairman of PricewaterhouseCoopers Scotland, onto the board.
But they repeated their demands for clear answers on the state of the Ibrox club's finances.
Mr Blin is an ally of Mr McColl, the chairman and chief executive of Clyde Blowers, who is attempting to force boardroom change by way of an extraordinary general meeting.
Mark Dingwall, Rangers Supporters Trust spokesman, criticised the directors' move saying that the time for reform had come.
He said: "The directors' statement is very disappointing as it doesn't provide clarity or leadership. They should have taken the opportunity to address the concerns of those investors who have called for an EGM.
"Conducting a very public game of divide and conquer with your critics is totally unbecoming. We believe the board should have taken the opportunity to make meaningful reforms or gone straight to an EGM. The board has to face up to the reality that the fans want coherent answers regarding the spending of £40m."
Mr Dingwall welcomed the departure yesterday of former chief executive Charles Green. He stepped down as a consultant hours before the board voted to strip him of the post.
He said: "I think Mr Green has bowed to the inevitable. His behaviour during the last fortnight has been reprehensible, in terms of undermining the manager then giving an interview to a Sunday newspaper that incurred the displeasure of the chief executive.
"There have also been revelations about his connections to Craig Whyte which have made his position untenable."
However, Drew Robertson, general secretary of the Rangers Supporters Association, said the board's attempt to calm the situation should not be taken lightly.
He said: "It looks like [the directors] are trying to come up with a compromise and I think a lot of people would agree with that.
"It would make sense for the club if they sat down and came to some sort of agreement that suits both the people who want an EGM, and the board.
"Some people say that an EGM is necessary to get to the bottom of what's been going on, but if we can resolve things without that then so much the better."
He added: "I do not know much about Frank Blin. Neither camp has put up a very convincing case about why they are the right people to run the club.
"The McColl camp believes there is enough concern there to force an EGM, and it does not think the board has a strong enough case to take the club forward. But we don't know enough about them either."
l Former Scotland striker Kevin Kyle has said that gambling on football games is widespread among Scottish players. He was speaking after Rangers player Ian Black was issued with a notice of complaint from the SFA for allegedly breaching regulations on football betting. Kyle said: "It's just the culture we are in. Gambling is rife within football."