League bodies have agreed in principle to a new structure, in which the top two divisions would feature 12 teams, with 18 teams to compete in the third tier.
The Scottish Premier League and Scottish Football League are set to vote on the proposals this month.
Green has launched an attack on the plans - which could be implemented by the start of next season - and said Rangers may even leave Scottish football as a result.
"My advice to the board of Rangers is the quicker we can leave Scottish football the better," the chief executive told RangersTV.
"I can't see anything that is going to transform the finances, the status or the excitement.
"On first glance, of course, there is nowhere for us to go because FIFA have made their feelings known on cross-border leagues.'
Many North of the border see the outburst as the first warning shots as Rangers try to improve their own position in the new scheme of things. As things stand it looks like they could still be in the bottom tier - albeit an enlarged division even if, as seems certain, they run away with this seasosn Scottish Third Division.
Meanwhile, Scottish Football Association chief executive Stewart Regan hopes to convince fans the country does not need a larger top flight.
Fans have expressed a desire for the top division to be bigger.
"I think there's an educational exercise that we need collectively to go through," said Regan.
"We'll be working very closely with [fans group] Supporters Direct in order to make sure that those messages are delivered.
"Fans have spoken about a 16-team league but one of the underlying points made after that is because they'd like to see more games.
"In reality, a 16-team competition delivers less games than the proposal that we're examining at the moment for 12, 12 and 18."
The Scottish Football League, which currently comprises three leagues of 10 below the 12-team Scottish Premier League, had pushed for a 16-10-16 format but both league bodies, who would merge under the latest plans, will now ask their members to consider a 12-12-18 set-up.
SPL chief executive Neil Doncaster commented: "We have to focus on what's vital.
"What's vital is that we safeguard the existence of clubs who are relegated into a financial situation which is very difficult for them to manage at the moment.
"We have to create more promotion opportunities, we have to ensure that there's a pyramid for the game as a whole.
"There's a desire for a single league body. All of these things are fundamental to what we've discussed.
"The numbers, actually, are perhaps less important than those issues which are fundamental to the future good of the game."
PROPOSED SCOTTISH LEAGUE RESTRUCTURE
•SPL proposal is for a 12-12-18 structure
•Top two leagues to split into three leagues of eight after 22 matches then play a further seven home and seven away games
•Leagues will be called Premier Division, Championship and National League
•Top eight teams to play for title and European places; middle eight to contest promotion and relegation in and out of Premier Division; bottom eight to decide who drops into National League
•11 out of 12 SPL clubs need to vote in favour of plans, while the proposal requires approval of 23 out of 30 SFL clubs
•One league body to replace SPL and SFL