Neama Rahmani, a former federal prosecutor, told Page Six: “She may name anyone connected to her, anyone who supplied to her or she supplied to.
“Hollywood celebrities should be quaking in their boots … anyone who has anything to do with Jasveen Sangha should be really concerned right now.”
The other people charged include two medical doctors, Salvador Plasencia and Mark Chavez, who are accused of working together to procure ketamine illegally and supply it to Perry in September and October last year.
Dr Chavez has already entered into a plea agreement with prosecutors over the charges, and pleaded guilty.
Their alleged supply chain, using legitimate wholesalers, was separate to Ms Sangha’s “stash house” in Hollywood, prosecutors said.
A fifth man, Erik Fleming, is accused of acting as a go-between for Perry’s assistant and Ms Sangha.
Mr Fleming is a former entertainment industry worker who directed Scarlett Johansson in a 1999 children’s film.