Deals including Colombian players said to have been assisted by man with links to cocaine traffickers in Latin America.
At least two Porto transfers in 2012 have been linked to the notorious Juarez Cartel in Mexico, after a representative from a third-party intermediary involved in the moves was sentenced for laundering drug money.
The contracts of Colombians Jackson Martinez and Hector Quinones were signed with the help of Grupo Comercializador Conclave, according to a report in Aristegui Noticias.
A representative of that group, Rodolfo Davila Cordoba, has been sentenced for laundering money for the Juarez Cartel.