Unal Aysal, one of Turkey's most successful businessmen who became Galatasaray president two years ago, was speaking at the Leaders in Football industry conference.
While Agnelli was more considered in his responses, saying that the current format needed to be looked at and that the Europa League especially required revitalisation, Aysal was far more expansive.
"Changing things brings new energy and synergy to the system," he told reporters.
"We have arrived in a stagnant situation in European football, we are not improving too much. This will open a new chapter in European football.
"The top 15-20 big clubs of Europe all agree with this.
"There may be one or two exceptions for local reasons, political reasons, and I will understand, but as the future for European clubs and the future of football, nobody can say no to this.
"At the moment it looks like a dream, a vision, I am sure sooner or later, in a maximum of five years time, it will be a reality.
Aysal said the league was the future of football and needed to be set up as soon as possible.
"Football is a great industry, a growing industry. A European super league would bring a lot of support and energise football in general," he said.
"I think it would be 20 big teams, with three to five teams changing every year. It can be fixed in a way to be useful to European football and bring new horizons to football.
"It can be controlled by UEFA or the clubs - preferably by the clubs. Clubs will have to reach standards set by certain criteria like financial fair play. It would be good for all European clubs to participate in this league."
Aysal said the starting point might be the 20 biggest clubs breaking away from UEFA but a spokesman for the ruling body said it was not aware of any plans to form a new league.
Agnelli, 37, who has been president of Juventus for nearly four years, told delegates: "If one wants to break out of the system then probably the best competition is a closed competition with the 20 best European clubs," he said.
"We can have a secession but do 20 clubs have the discipline to send a letter to UEFA and to organise a competition overnight?"
Agnelli later clarified his comments to reporters by saying he was merely taking an "academic" position.
"If you are part of a system you accept that system and want to improve the system," he said.
The Champions League, which replaced the European Cup in 1992-93, has grown to be widely accepted as the premier club competition in global sport, generating billions in revenue every season.
At the moment Europe's top clubs, through the European Club Association, have a Memorandum of Understanding with UEFA that runs until 2018 and a spokesman for the ECA said in response to Aysal's claims that "a new competition has never been discussed" by the 214-club organisation.
Aysal said two major brands had expressed an interest in sponsoring a new league, adding that he did not expect clubs to break away from their domestic leagues but to have squads of 40 or 50 players, some of whom would play domestic league matches and others European games.
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