Ally McCoist, the Rangers manager, last night dismissed suggestions he and Walter Smith are trying to mount a boardroom coup to take control at Ibrox.

An internal investigation was launched after it was reported that Imran Ahmad, the commercial director, had posted sensitive information on a fans' forum, allegedly including one message which said: "Walter and Ally are trying to take control of the club without putting any money in."

Ahmad's future at Rangers is in jeopardy amid the ongoing independent commission looking at alleged business links between him his ally Charles Green, the former chief executive, and the club's disgraced former owner, Craig Whyte. Rangers remain mired in uncertainty and anxiety but McCoist laughed off the suggestion that he and Smith, now a non-executive director, were trying to dilute the other board members' power.

"It [the allegation] didn't upset me at all because the vast majority of people will know it is not true," he said. "Anything Walter and I would do is certainly, in our opinions, for the best of the football club.

"We have in no way, shape or form attempted to take over the football club. I can speak for Walter because I know the man. Everything we are doing is to benefit the football club. But we are not trying to take it over. That's absolute nonsense. What we are trying to do is our own wee bit to take us forward."

The departure of Green, the question marks over Ahmad, the ongoing inquiry, the lack of knowledge about the new interim chief executive Craig Mather and numerous other issues all contribute to the general sense of uncertainty and suspicion around the club. McCoist said he hoped supporters would take reassurance from the presence of familiar figures such as himself and Smith.

"I would hope so. I'm a lot happier having Walter on the board. This time last year it was all very new to us but I think it's fair to say the supporters have the utmost faith and trust in Walter. We will obviously make mistakes, like anybody else would, but any that Walter and I make will be in trying to do the best for this football club."

McCoist added: "Is it vital that when the dust settles some Rangers men are still on board. I think that message has to get out to the supporters, to reassure them. No doubt they will be disillusioned. They must be saying to themselves, 'just what is going on?' and I can totally understand that. I am just hopeful that at the end of the inquiry we can give them the answers – and give ourselves the answers – we deserve to know."

McCoist acknowledged many fans are likely to delay buying season tickets while so much is unclear about the club's future, its ownership and its executive management.

"I think they would be well within their rights to do that," he said. "They will need as much information as they can possibly get before making their minds up. That goes without saying, I would think. The fans deserve to know and I would be very hopeful that, after however long it may be, there will be a plan set for them.

"There are a couple of investigations going on, so I can't anything that will prejudice any of them. You just look at when it is going to end and when we can get back on to talking about football again."

Mather, the 43-year-old Nottingham-based businessman, became Rangers' interim chief executive this week and it will be essential that he has a trusting relationship with McCoist. He became director of sporting development after investing £1m last summer but has not been prominent around the club until now. He and McCoist will have a proper meeting on Tuesday to discuss budgets.

"I've met him a couple of times but I met him in his new role yesterday and I am meeting him early next week to push ahead with potential budgets and to discuss players coming in and out, things like that," McCoist said. "I will have a more in-depth meeting with Craig when we can hopefully push things forward.

"It's a new relationship, one that is as new to Craig as it is to me. In all my meetings with him he has seemed up front and is obviously delighted to have the job. He has been quoted as saying he would like to get it full-time. Time will tell if that develops.

"I have said all along that the most important relationship at a football club is between the manager and the chief executive. I really believe that, so I will do my utmost to make it a healthy working relationship and I don't have any doubt Craig will too."

McCoist hoped to be able to announce one or two pre-contract agreements next week, for players who would join when the SFA transfer embargo is lifted on September 1. "We have a big list of players. I've spoken to five or six in the last three or four days," he said. "There is certainly no shortage of goodwill on our part to get players to come to the club.

"That is an absolute must. You can see where we are at the moment. Lee Wallace is out with a knock to his knee [for today's lunchtime game against East Stirlingshire at Ochilview] and we are bringing in boys from the under-17s. That's fine because, thankfully, we have won the league but without sounding like an old broken record we need to get players in to take us to the next step."

McCoist will have discussions with Carlos Bocanegra, whose season-long loan at Racing Santander is coming to an end. The 33-year-old tweeted that he would return to Rangers but the size of his salary would make that seem highly unlikely.

"He has a year to go on his contract so unless something happens I take it he will be back," McCoist said. "I haven't spoken to him yet but I am due to phone him and I will give him a call."