Atletico were one of the 12 founding clubs to initially sign up for the tournament, which was announced on Sunday, but their plans crumbled within 48 hours.
The backlash was significant on Monday and then Tuesday proved pivotal, as English clubs took note of the passionate response from fans, media, players and coaches.
Official statement.— Atlético de Madrid (@atletienglish) April 21, 2021
Manchester City became the first to withdraw, followed by Chelsea, Arsenal, Liverpool, Manchester United and Tottenham. Atletico, Inter and Milan followed on Wednesday
Atletico boss Simeone did not take the opportunity to openly criticise the plans during a press conference on the eve of Thursday's LaLiga clash with Huesca, as Jurgen Klopp and Pep Guardiola did in previous days, but accepted it was the right decision.
Speaking of his talks with Atletico CEO Miguel Angel Gil Marin, Simeone said: "Going into what he told us is not appropriate, but we saw doubts about this situation and what happened later, last night, when the clubs began to leave the Super League.
"I was told after the last game, I understood that the club was going to decide what was best for the club. The club has looked at our fans, employees, players, president – the Atletico family."
When pressed for his own opinion, Simeone added: "Listen to what I said before. I was clear, concrete and true. There is nothing to hide.
"I was one of the first to be consulted after the match and I said that I absolutely trusted the club because they were going to do what was best for the club. We understand that this situation [the withdrawal] is good for everyone. We all belong to football – before being footballers and coaches, we are fans.
"They have known me for a long time, I do not like demagoguery or taking advantage of situations to strengthen myself.
"What I think, I tell the people I have to talk to. I do not like to express myself here."
Simeone still expects the events of the past few days to contribute to significant change in European football.
"Faced with seismic movements like this, something is going to change, for sure, I have no doubt," he said. "And for the better, don't get me wrong.
"When there are movements, the parties will have to get closer and find what everyone wants or wanted before."