Any proof of manipulated games in the past 16 years could see UEFA exclude Barcelona from its competitions for one year and prosecute a disciplinary case.
The decision, made official on Friday, was reported this week by Spanish newspaper El País. An investigating judge will decide whether the accusations should lead to charges.
A Spanish court has acquitted soccer star Neymar and his fellow defendants in a fraud and corruption trial related to the Brazilian's 2013 transfer from Santos to Barcelona.
Others siding against the club include the Spanish government, the Spanish league, Real Madrid and more clubs.
Former Barcelona defender Alves was provisionally detained in January after being accused of sexually assaulting a woman at a nightclub on Dec. 30.
After a court found there was enough evidence to imply the pop artist may have dodged her fiscal commitments to the state, the verdict clears the way for a trial.
Spanish football was rocked last month when it became public that Barcelona has paid millions of euros to possibly benefit from refereeing decisions for more than a decade.