UEFA are carrying out investigations into 76 European clubs who could be in breach of Financial Fair Play rules, reports Sky Sports.
It is believed that Manchester City and PSG are two of the clubs that have been asked to provide financial information for last year's transactions.
All 76 failed to met the targets for 2012, and therefore are required to provide details to a independent panel who will check that the finances meet the set criteria.
Seventy-six clubs represents a third of all clubs playing in Europe, which is a worryingly high number.
The first set of sanctions will be handed out in April, with the case deemed to be more serious being dealt with in June.
UEFA have stated in the Financial Fair Play rules that a possible punishment for failing to met the criteria could be expulsion from European competitions.
One of the requirements states that players wages and taxes must be kept up to date.
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