(CNN) The offices of top Portuguese soccer teams SL Benfica, FC Porto and Sporting CP were raided by Portuguese authorities on Wednesday, as part of a massive anti-corruption probe.

The offices of superstar agent Jorge Mendes -- who represents players including Cristiano Ronaldo -- were among a number of locations searched according to several reports in Portuguese media.

The Portuguese Prosecutor General's office says it has established 47 entities -- both collective and individual (including soccer players, agents, lawyers and club officials) -- and placed them under official investigation on suspicion of fraud and money laundering.

In a statement, the Portuguese Prosecutor General's office confirmed 300 officials, including more than 100 tax inspectors, 180 police and more than a dozen magistrates were involved in 76 raids across the country.

As part of what authorities called "Operation Offside" investigators are looking into transfers completed since 2015, which are suspected of "activities destined to evade paying taxation due to the state.".

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