Proposals have been put in place by the SPL - which proposes a new-look system in Scottish football - with three leagues consisting of 12, 12 and 18 teams.
St Mirren have already made their position against the plans clear and, with a 11-1 vote needed from the 12 clubs in the top-flight for the idea to progress, Ross County's vote is crucial.
MacGregor will consult with supporters and also his manager Derek Adams, who has already branded the plans as "ridiculous" before making a decision by the weekend ahead of the actual vote which takes place on Monday.
"There are a lot of things in the plans that are right, but a lot that are wrong and there is still a lot more talking to be done," MacGregor said.
"My worry has been the supporters have been forgotten about in all of this. In the long term, this may be the start of people not buying season tickets. People may be unsure about what they are buying into. It is complicated and people have perhaps been trying to rush this too quickly.
"Everyone wants one league body. Everyone wants a redistribution of money down the leagues from the SPL. Everyone wants more competition with play-offs.
"There are some really good things in the plans. The difficulty is the number of teams in the league, whether that is 12, 14, or 16. The difficult part is most people recognise clubs need a minimum of 36 games for the revenue required to run a full-time club."
With the majority of the SPL clubs backing the plans, Stephen Thompson, the Dundee United chairman, has urged MacGregor and his other counterparts to back the plans.
"If I was thinking solely about Dundee United I wouldn't vote for this," he continued.
"But this package is the right way forward for everyone. What has made me change my mind about it? The clubs in the first division are struggling. If you get relegated then it's a disaster financially and we have to address that.
"The all-through distribution model is a huge thing. It means the money goes right through the leagues. The clubs in the first division will get £350,000 instead of a fraction of that. We need to push money down the leagues for everyone's benefit. And getting one league body is a step in the right direction.
"There are things in the package I don't like, such as stadium criteria. But I am prepared to overlook that for the greater good of the game. There's no Plan B on this. There's no SPL2. There's no other votes going to happen. If it doesn't go through then I fear where we're going to be five or six years from now. Something needs to happen to change things."