Just 16 of the 30 SFL clubs gave reconstruction proposals their backing in an informal ballot at the annual general meeting at the national stadium last month - Rangers do not get a vote as they are associate members having joined last summer.
The Second and Third Division clubs met subsequently to discuss a threatened breakaway by the 10 First Division clubs, a threat which remains in the background. When all the SFL clubs reconvene in the south side of Glasgow for a formal vote, Darroch is hoping that a solution involving all 42 senior clubs will be agreed upon.
However, he is not certain that 22 clubs - the number needed to see the plans go ahead - will vote in favour.
"I think it will be tight, I think it is hard to call," Darroch told Press Association Sport. "Some clubs will still be making their minds up as they travel to Hampden. The clubs got some documentation only yesterday and I have still to have a look at it.
"We are not totally 100 per cent happy but the general feeling is that it is better we have all 42 clubs together than have a split. There was a meeting between the Second and Third Division clubs after the AGM and I detected a softening among some clubs but I can appreciate there are a number of different and legitimate concerns among them.
"The governance needs to be right, and the voting structure is not as equitable as it could be but we have been debating this for a long time so hopefully we get it over the line."
Third Division Stirling Albion are set to vote in favour of the plans but director Stuart Brown is also cautious about the outcome.
He told Press Association Sport: "It is on a knife edge. As a board we have agreed to vote yes on the basis of information that we have been given but more information is becoming public all the time which means it might not be as straightforward as some people might think.
"There is a lot of talking to be done."