The Mexican soccer star Rafael Márquez and several of his businesses have acted as fronts and held assets for a major drug trafficking organization, the United States Treasury Department said Wednesday after it added the player’s name to a list of people and entities that face financial penalties and possible forfeitures for such ties.

Márquez, who plays for the Mexican club Atlas and has represented Mexico at the last four World Cups, was placed on a Specially Designated Nationals list by the Treasury Department’s Office of Foreign Assets Control. Márquez appeared voluntarily in the Mexican attorney general’s office Wednesday to make a statement, the attorney general’s office said in a news release. The office added that it was working closely with the Treasury Department in a continuing investigation.

Márquez and nine businesses linked to him, including his soccer school and charitable foundation, were among the 22 individuals and 42 entities added to the list by the Treasury Department on Wednesday. All were accused of providing support to, or being under the control of, another Mexican national, Raúl Flores Hernández, and what the department called the “Flores drug trafficking organization.”

In March, Flores Hernández was indicted on a federal drug trafficking charge.

At a news conference at Atlas’s practice facility on Wednesday, Márquez denied any connection to the drug trafficking organization and promised to cooperate with the authorities in the investigation.