The Gers boss has spoken to two players about a switch to Ibrox during the close season but still has no definitive plan in place from chief executive Graham Wallace as he continues his review of the club's on and off field operations.
After bringing in a host of stars last summer, McCoist is eager to continue strengthening his ranks ahead of Rangers' potential return to Scotland's top tier the season after next.
But the Gers boss knows he could miss out on targets while the future remains uncertain.
"That would have to be a concern, but there is nothing we can do about it," McCoist said.
"Players will have to look after themselves, because they have livelihoods and families.
"But until we can actually offer them anything, we just have to wait and be ready to go."
McCoist has been linked with moves for former Gers striker Kris Boyd, Motherwell defender Shaun Hutchinson and St Mirren's Kenny McLean in recent weeks.
And he is eager to start his shopping as soon as possible.
McCoist said: "I've been told by Graham that I'll know what the budget is soon.
"I'm obviously bursting to get moving, I want to get things sorted for the start of next season.
"I'm not writing this one off because we have five games to go, which could see us going through a league campaign unbeaten. That's the target.
"But I have to do my job. I'm looking at pre-season, I'm looking to strengthen areas of the squad and the team.
"It's right to say if season ticket money was witheld, it would affect the budget. But that's something Graham has to answer. I don't dictate the budget, that's his job.
"I've spoken to two players and there are others out there.
"But it's difficult because I can't talk to them and then say 'I might come back and speak to you again'. I have to be honest with them and we need to get moving.
"I have one conditional 'yes'."