Essendon coach James Hird was never the subject of a drug squad investigation and claims his house was raided are false, according to detectives involved in the case.

Former strength and conditioning coach Dean Robinson told Channel Seven that Hird had revealed that his house had been raided by Federal Police. Hird has since denied the claims.

Hird was spoken to as a potential prosecution witness when his then personal trainer, Shane Charter, was arrested over possession of a large quantity of pseudoephedrine.

As part of the investigation police seized nearly $500,000 from a Collins Street safety deposit box.