Police have charged a man just days after reports a nine-year-old boy was locked in a 'cage' at a Perth supermarket.

The incident happened on December 30 at Kelmscott IGA on Albany Highway.

It has been alleged the boy was locked in a storeroom after trying to steal to steal a bottle of Coke.

As a result of inquiries Armadale Police have charged a 41-year-old Karrinyup man with aggravated common assault and deprivation of liberty.

The man will be summonsed to appear in Armadale Magistrates Court at a later date.

Inquiries are continuing into the matter.