The SPL and Scottish Football League last month drew up significantly different plans to change the league format, although Scottish Football Association chief executive Stewart Regan last week said he was encouraged with the common ground secured in talks with both bodies.
SPL chief executive Neil Doncaster last month revealed the 12 top-flight clubs had all backed plans to expand their membership but it is unclear how much support there is for a plan for the two divisions to split into three groups of eight midway through the season.
And Green has warned the SPL not to assume that SFL clubs would rush to join their ranks.
The Englishman, who repeated his personal stance of refusing to join the SPL in protest at the rejection of his newco application in the summer, told Rangers TV: "I'm not sure SFL clubs will rush to join the SPL. There is a big sense of injustice about how they were being told what to do over where Rangers should go and we all saw the outcome of that.
"They were told to put Rangers in the First Division and quite rightly the SFL clubs didn't listen and put us in the Third Division and we are happy to be there.
"So I think people have read it wrongly once and they need to learn from their mistakes and get it right next time.
"I've seen the SFL proposal and the SPL version of what should happen. There are merits in both but what it needs for all the clubs to sit down."
Green also called for an outsider to help with reconstruction, although plans put forward by former First Minister Henry McLeish in an SFA-commissioned review two years ago, which included top-flight play-offs, have not been introduced.
The 30 SFL clubs unanimously backed plans for a 16-10-16 structure but they are unlikely to be adopted by the SPL.
The SPL meet tomorrow on the backdrop of the resignation from the board of Dundee United chairman Stephen Thompson last week.
Thompson cited "professional differences" as he became the third board member to step down in six months following St Johnstone chairman Steven Brown and Motherwell director Derek Weir.