A 49-year-old Nigerian national, Dirichukwu Patrick Nweke, awaiting deportation from Australia, and another man have been charged in connection with a massive $9 million drug operation run from the Villawood Detention Centre in Sydney.

Police allegedly found 2kg of meth hidden in porridge boxes during a raid on July 11.

Nweke was charged with multiple counts of drug supply and directing a criminal group.

Police claim he used an encrypted messaging service to coordinate a network of runners distributing meth and cocaine throughout Sydney.

Further raids in Sydney's east and west led to the arrest of a 24-year-old man, alleged to be a runner for Nweke, and the seizure of 750g of meth, 180g of heroin, and $325,000 in cash.

The operation resulted in the dismantling of three separate drug syndicates, with a total street value of over $9 million. Nweke was refused bail, while the alleged runner faced court on the same day as his arrest.