JPMorgan made itself heard on Friday for the first time since the Super League debacle.
With 3.5 billion euros, the American bank was the largest investor in the failed elite competition in European football.
"It is clear that we have misjudged how this deal would fall in the football world and what impact it would have. We will learn from this," said a JPMorgan spokesperson.
Plans for the creation of the Super League fell within 48 hours of being revealed this week.
On Sunday evening, twelve clubs from England, Spain and Italy announced that they would start a closed and very lucrative competition.
This led to furious reactions from FIFA, UEFA, national associations and fans.
Under pressure from that criticism, the six English clubs Arsenal, Chelsea, Liverpool, Manchester City, Manchester United and Tottenham Hotspur withdrew on Tuesday.
Atlético Madrid and Internazionale then also reported that they would not participate.
The other four clubs - AC Milan, Juventus, FC Barcelona and Real Madrid - had to accept that the Super League could not continue.
A number of those clubs have expressed the hope that the competition can continue with a different set-up.