The Premier League says it is tightening its rules to stop any future attempts at a breakaway structure.
The English FA has opened an investigation into the Superliga rebellion and has called for evidence from the six English clubs involved in the breakaway which could lead to punishment.
The Premier League also disclosed on Monday that it had prepared measures to stop teams playing in closed competitions.
Arsenal, Chelsea, Liverpool, Manchester United, Manchester City and Tottenham launched an unfortunate attempt last month to found a new European competition with three clubs from each of Spain and Italy.
But after 48 hours of intense protests and criticism, which continue to reverberate through English football, Premier League clubs retired of the project last week.
“Last week we launched an official investigation into the formation of the European Super League and the participation of the six English clubs,” an English FA spokesman said on Monday.
“We wrote to all the clubs to formally request all the relevant information and evidence about their participation. Once we have the necessary information, we will consider what steps need to be taken. It is clear that what happened was unacceptable and could have caused great damage to clubs at all levels of English football, “he added.
New letter from owners
The Premier League said it was also studying the behavior of the six clubs.
“We are determined to establish the truth of what happened and hold these clubs accountable for their decisions and actions,” he said in a statement.
The league added that it was tightening its regulations to stop any future attempts at a breakaway structure.
A new “Charter of Owners” will be introduced as part of the governance of the league: all club owners will have to register “committing to the basic principles of the Premier League”.
“Failure to comply with these rules and the Charter will be subject to significant sanctions,” the league added.
The UK government has launched a review of the game to be headed by former Sports Minister Tracey Crouch and the Premier League said it was in talks with the government “to introduce appropriate legislation to protect the open pyramid of football, the principles of sporting merit and the integrity of the football community ”.
Manchester United fans on Sunday shocked with police and invaded the pitch before his planned Premier League match against Liverpool, which was postponed as a result.
There have also been protests at Chelsea and Arsenal since the Super League plan was announced.
“The fans have played a vital and impactful role in helping prevent the European Super League from happening, and we understand their frustrations,” the FA spokesman said.
“However, we cannot tolerate the violent and criminal behavior that took place before the planned match between Manchester United and Liverpool, which the FA is investigating now.”
The Premier League urged any protest to remain peaceful.
“We are committed to maintaining a close dialogue with supporters and their representatives as we work with the FA and the government to identify solutions, but we call for all protests to be peaceful,” he said.
“The actions of a minority of those present at Old Trafford on Sunday have no justification and will be investigated by the Premier League and the FA, as well as by Greater Manchester police.
“The actions of some clubs cannot be allowed to create this division and this disruption.”
The Superliga argued that it would increase revenue for the best clubs and allow them to distribute more money to the rest of the game.
However, the governing bodies of sport, other teams and fan organizations claim that it would increase the power and wealth of elite clubs and the closed structure of the league goes against the European football model.
Unlike the elite European Champions League competition, where teams have to qualify through their national leagues, the founding teams of the Superliga would be guaranteed a place in the new competition every year.