NCB officials said Showik and Miranda, house manager of Rajput, were handed over summons to join the investigation during the raids.
The two have been charged under multiple sections of the anti-narcotics law and will be produced in a court on Saturday, sources said.
In the plea filed in a sessions court on Wednesday, Rhea also claimed that she has not committed any crime whatsoever and has been falsely implicated in the case.
The officials said Dipesh Sawant, who was being questioned since morning, has been arrested under sections of the Narcotic Drugs and Psychotropic Substances Act.
The family lawyer said he was getting "frustrated" by the delay in the CBI taking a decision in the case.
Pithani was Rajput's friend and was also staying with the late actor at his Bandra residence in suburban Mumbai, he said.
Officials said Gaurav Arya, who runs a hotel in the coastal state, has been asked to depose before the central probe agency at its office in the Ballard Estate area of Mumbai on August 31.
Showik is brother of the main accused in the case, Rhea Chakraborty, while Miranda was house manager of the deceased actor.
The Central anti-drug agency had filed the draft charges last month in the Special Narcotic Drugs and Psychotropic Substances Act Court against 35 accused, the details of which were made available on Tuesday.
The Central Bureau of Investigation on Monday questioned actress Rhea Chakraborty and her brother Showik for more than eight hours in connection with the Sushant Singh Rajput death case.
The agency acted swiftly on a reference from the government in Bihar, the home state of 34-year-old Rajput, where his family had lodged an FIR against Chakraborty.
This is her second attempt to seek release after a magistrate court on Tuesday refused to grant her bail. In the fresh plea, filed by her lawyer Satish Maneshinde, the 28-year-old actress claimed to be 'innocent'.
Several Bollywood personalities including Taapsee Pannu, Swara Bhasker and Anubhav Sinha criticised the media's mobbing of Rhea Chakraborty.
Sushant Singh Rajput's sister Shweta Singh Kirti posted a cryptic quote on her social media platforms saying people should think about the consequences before messing up with someone.
The court rejected Chakraborty's bail application. The NCB told the court that she was an 'active member' of a drugs syndicate and procured drugs for Rajput, her boyfriend.
In a game that had its moments, India had a great chance of scoring from a free kick after Gurkirat Singh was fouled near the Bangladesh box.
Commenting on the Narcotics Control Bureau investigation of a drug case, related to actor Sushant Singh Rajput's death case, Raut said, "The probe of the case started about murder and suicide. Now, narcotics came into the case. Nobody knows where will it go. It is under NCB's jurisdiction to summon anyone to join the probe."
Rajput's manager Samuel Miranda and cook Dipesh Sawant used to collect the contraband and make `joints' (marijuana cigarettes) for the deceased actor, a NCB officer claimed.
'She came yesterday, she came today... we talked to her all day, questioned her. So, I cannot say she is not cooperating. She will come tomorrow too. 'So we are getting her cooperation,' NCB deputy director general (DDG) (south-west region) Mutha Ashok Jain told reporters after the questioning session.
NCB Deputy Director General (south-west region) Mutha Ashok Jain told reporters outside the agency's office later that Rhea will be called again on Monday for questioning and recording of her statement like Sunday.
The duo was arrested last month by the Narcotics Control Bureau in connection with its drugs probe related to the case of Rajput's death.
Special Public Prosecutor Atul Sarpande had opposed their bail saying Rhea and Showik financed and arranged drugs.
Rhea, who was arrested by the Narcotics Control Bureau on Tuesday after three days of questioning, is currently in judicial custody.
The role of Rhea's brother Showik and his purported links with the people nabbed by the NCB are under the scanner of the agency and he and Rajput's manager Samuel Miranda are expected to be summoned for questioning soon, the officials said.
Their counsel Satish Maneshinde told the HC that the drugs case, in which Rhea and Showik are accused and currently in jail, should have been transferred to the Central Bureau of Investigation (CBI), probing Rajput's death, by the NCB.
The NCB further said both Rhea Chakraborty and her brother had "abetted and financed" drug transactions.
In her complaint sent to the Bandra police in Mumbai on Sunday, Chakraborty sought that Priyanka Singh and Dr Tarun Kumar, working with Ram Manohar Lohia Hospital in Delhi, be booked under relevant sections of the Indian Penal Code for forgery, the Narcotics Drugs and Psychotropic Substances (NDPS) Act and the Telemedicine Practice Guidelines.
Rhea was arrested by the Narcotics Control Bureau on September 9. The NCB has accused her of procuring drugs for Rajput.
Veteran striker Sunil Chhetri will be spearheading the Indian challenge and besides his longtime teammate Sandeep Jhingan, he will also be able to avail the services of Chinglensana Singh and Lalchungnunga.
The national federation, which was able to stitch together the team just three days before its departure for China, still thanked the Indian Super League clubs and the FSDL "for coordinating with it for the release of players".
In her bail application filed in the HC on Tuesday, Chakraborty said she is just 28 years of age, and besides the probe by the NCB, she has been subjected to three more investigations by police and central agencies, and a "simultaneous media trial".
The ED's line of questioning, officials said, is revolving around Rhea's income, investments, business and professional deals, and links.
'The investigation is at preliminary stage, therefore, from the available record, it can not be said that there are no reasonable grounds to connect the accused (Rhea) (to the case),' the court observed. The court also said there is possibility of the accused tampering with evidence if released on bail.
The Central Bureau of Investigation recently took over the probe in the case, based on a Patna police FIR related to alleged criminal conspiracy and abetment to suicide against Rajput's girlfriend and actor Rhea Chakraborty.
The submission by the actress in a 12-page affidavit in which she said the "constant sensationalisation" was causing extreme trauma and infringement of privacy of her rights came a day ahead of the next hearing of her plea for transfer of the Bihar police FIR against her from Patna to Mumbai.
Barcelona and Atletico Madrid led a Spanish Armada into the Champions League last 16 with home wins on Wednesday and in-form Aaron Ramsey steadied Arsenal's boat with a battling win against rocky Borussia Dortmund.
Inter Milan staged a late smash-and-grab raid as goals by Mauro Icardi and Matias Vecino secured a 2-1 home win over Tottenham Hotspur in their Champions League Group B opener on Tuesday.
News of all that's transpired on and off the football field
World champions Germany drew 1-1 with Spain in a high tempo friendly on Friday as they launched their preparations for a title defence in Russia while their opponents had striker Diego Costa making his long-awaited comeback as a substitute.