European football's governing body said that its legal department had verified the issue as part of routine procedures before the new club competition season. UEFA monitors the situation of all clubs taking part in its tournaments.
The European Union's competition laws and UEFA's competition rules forbid an individual owning a major share of two clubs in the same tournament. However, there are no laws limiting the amount that an individual can sponsor another team.
Abramovich has owned Chelsea since last summer. In March, CSKA signed a sponsorship deal with the Russian oil company Sibneft, of which Abramovich is the former owner and still the majority shareholder.
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