The Narcotics Control Bureau (NCB) had earlier asked Saha and Rajput''s former manager Shruti Modi to appear before it on Monday.
Saha reached the office of NCB''s Special Investigation Team (SIT) in south Mumbai around 2 pm, an official said.
The Mumbai Police have barricaded the area around the SIT''s office.
Modi''s questioning was postponed on September 16 after a member of the SIT tested positive for coronavirus.
Rajput (34) was found hanging in his flat in suburban Bandra on June.
The federal anti-drugs agency has so far arrested more than a dozen persons, including Rajput''s girlfriend and actress Rhea Chakraborty and her brother Showik Chakraborty, in the case.
Meanwhile, the NCB is going to summon Bollywood actors Sara Ali Khan and Rakul Preet Singh, and fashion designer Simon Khambata this week in connection with an ongoing drugs probe, a senior official of the probe agency said.
Rakul Preet Singh last week moved the Delhi High Court seeking to stop media reports from connecting her with the Rhea Chakraborty drug case.
She said leaks to the media need to be investigated as "someone''s reputation is totally destroyed by it".
The high court on Thursday sought the Centre''s reply on her plea.
The actor, represented by advocate Aman Hingorani, claimed in her plea that Rhea Chakraborty had already retracted the statement in which she was allegedly named and yet the media reports were connecting her to the case.
Hingorani further said his client came to know about her being named in the case from "breaking news" on TV channels which said that she along with actor Sara Ali Khan and designer Simone Khambatta, have been named by Chakraborty as individuals who take drugs. PTI ZA GK GK
Disclaimer :- This story has not been edited by Outlook staff and is auto-generated from news agency feeds. Source: PTI