The Ibrox side have signed Ian Black, Dean Shiels, Kevin Kyle, Francisco Sandaza and Emilson Cribaro so far, although a deal for striker Craig Beattie is now unlikely to happen.
However, the Gers boss, who will face a 12-month transfer embargo from September 1, is still wanting to stock up as he fears there will be further departures.
Carlos Bocanegra and Dorin Goian remain on decent wages, and are expected to move on before the transfer window closes at the end of this month.
And McCoist is wary of being caught short. He said: "We have certainly got players we are looking at to get on board. The maths would indicate we need to get bodies in and we need to get players in.
"We have lost 23 or 24 to date and there is a fair chance we will lose even more before the end of the window. We have brought in five or six and we have an embargo coming so we will definitely have to bring more in, just in case of long-term injury or suspension.
"I'm quite confident we'll get more players in."
And the Rangers manager has also urged the Ibrox support to get firmly behind the Charles Green consortium.
Sales of season tickets have picked up pace in recent weeks and it is believed around 20,000 have now been sold.
But Rangers are desperate to sell more and have extended the deadline to accommodate more fans who want to lend their support to the club in what will be a surreal campaign in the Irn-Bru Third Division.
"The new owners came in, they were the only party that came up and put their money where their mouths were," said McCoist. "They stood tall and bought the club so in that respect they deserve great support from us and from the fans.
"I've watched Charles and I don't have any doubt he's watched me in recent weeks. He has absolutely nailed his colours to the mast in terms of his work ethic and the hours he has put it.
"He has done his best for Rangers and fought for the club and represented the club to the best of his ability.
"I am a firm believer that the most important relationship at a club is between manager and chief executive.
"We are in the very early days of ours, but it is growing day by day and we each have a good appreciation of the other's situation within the club.
"We are certainly both of the view that we want to take the club forward."