Two outreach workers linked to Melbourne's controversial safe injecting room will face charges over drug deals in Richmond.

Eight people were arrested on Thursday, including a 49-year-old Richmond man and a 36-year-old Brunswick West woman, who both worked in the same health facility as the injecting room.

The female staffer was arrested at the North Richmond Community Health centre, while the male staffer was arrested nearby on Victoria Street.

The man was later charged with trafficking a drug of dependence. He has been bailed to appear at Melbourne Magistrates Court on October 29.

The woman is expected to be charged on summons with trafficking a drug of dependence.