The case of Roman Abramovich’s interests in both Chelsea and CSKA Moscow, as mentioned in the question, was subject to investigation, and UEFA’s conclusion was based on their assessment of the circumstances.
In general, UEFA and other football governing bodies aim to maintain the integrity and fairness of competitions. If there are concerns about conflicts of interest, they typically conduct thorough investigations to determine whether any rules have been violated.
For fans of PSG and Barcelona, it’s essential to trust in the regulatory processes in place and to enjoy the match with the understanding that football authorities will address any potential conflicts according to established rules and guidelines