The European Professional Football Leagues has already raised several objections regarding the overhauling of the biggest continental tournament.
The plan of allowing the top 4 teams from England, Spain, Germany and Italy has already been opposed.
Daily Mail quoted Scottish football Neil Doncaster said:"The threat is very real, very significant, we are only talking about the cycle of 2018/21 but the direction of travel that UEFA has embarked upon is a very dangerous route.
"It threatens the very future of very top-level football and it is vital that a line is drawn in the sand now and the EPFL take the firm stand that is required and start to all back some of the very damning proposals.
"The closed-shop is the direction of travel a number in Europe would like to see and it is outrageous that UEFA can preside over a situation where that is the direction of travel.
The fear is that we end up with a closed-league situation. I was at the Celtic v Man City game last week, probably one of the best group games and a fantastic spectacle enjoyed by many across the world."
According to reports, the English club will oppose the new proposals made by the organisation.
According to a Premier League source: "This is a red-line issue that we wouldn't even contemplate."
Even though, English clubs are opposing the plans, Spanish, German and Italian clubs are apparently onboard with UEFA.
Doncaster further added: "I have been in the game 20 years, I have never seen the game in Europe as united against a set of proposals, it is unique that you have representatives of the small, large and medium-sized leagues against damaging proposals from UEFA."