Manchester City Banned from the Champions League
In 2020 Manchester City FC were BANNED from the Champions League for breaking Financial Fair Play (FFP) rules.
Before FFP was introduced over half of the European clubs were in debt. Several top level clubs had gone bankrupt recently too. The rules were created to:
prevent clubs going bankrupt
prevent billionaires from buying clubs and using their money to make the team win
Chelsea - Russian Billionaire
Man City - Abu Dhabi Royal Family
PSG - Qatar Royal Family
Man City was banned because they lied about their sponsorship money from Etihad Airways (which is also owned by the Abu Dhabi Royral family). Most of the money was actually from their owner.
Q: How do football clubs make money?
TV rights
Sponsors - on the shirt, in the stadium, commercials
ticket sales
player sales
selling merchandise
prize money (based on league position, round of the cups you reach)