The Football Association is investigating Liverpool’s role in the Super League plot.
Six Premier League clubs including Jurgen Klopp’s side had agreed to join a proposed 12-team European breakaway competition at the end of last month.
Anfield chiefs formally retracted their involvement in the tournament alongside their top flight peers within less than 48 hours of signing up.
But the FA are now set to probe what part the Reds, whose owner John Henry was listed as a Super League vice-president, played in the scheme.
English football’s governing body confirmed on Monday it has written to all of its six clubs involved and taking steps to prevent the Suepr League’s return.
“Since we became aware of the European Super League our priority and focus has been on preventing it from happening, both now and in the future,” confirmed an FA statement
“Throughout this period, we have been in ongoing discussions with the Government, the Premier League and UEFA.
“In particular, we have been discussing legislation with Government that would allow us to prevent any similar threat in the future so that we can protect the English football pyramid.
“Last week, we started an official inquiry into the formation of the European Super League and the involvement of the six English clubs.
“We wrote to all of the clubs to formally request all relevant information and evidence regarding their participation.
“Once we have the required information, we will consider what appropriate steps to take.
“Clearly what happened was unacceptable and could have caused great harm to clubs at every level of English football.”
Fallout from the Super League has manifested in a series of supporter-led protests including one which saw Liverpool’s game with Manchester United postponed.
Home fans made their way into Old Trafford ahead of Sunday’s scheduled fixture and remonstrated on the pitch against their owners the Glazer family.