The Latics have been fined £40,000 for a breach of regulation C10(a)(i) of the football agents regulations, but exact details of the transgression haven't been released.
Both the Latics and agent William McKay admitted the breach at an Indpendent Regulatory Commission hearing.
A club statement about the fine read: "Wigan Athletic are aware of the decision and are awaiting the full findings of the Independent Regulatory Commission to enable us to review our position in respect of the decision."