The anti-graft body had recorded sacked Delhi minister Kapil Mishra's detailed statement last week. Mishra has also been called tomorrow for further questioning.
ACB chief Mukesh Kumar Meena said that Bibhav Kumar, private secretary to Kejriwal, has been called for questioning on Wednesday in the case.
Mishra is also likely to be questioned again tomorrow. He is currently hospitalised after he fainted during a press conference in which he revealed purported details of alleged financial irregularities committed by the Aam Aadmi Party for its donations.
He has been on a hunger strike demanding details of Kejriwal and his team's foreign tours.
If Mishra is not able to appear tomorrow since he is unwell, he can also come day after tomorrow, said another officer.
Mishra had alleged that Kejriwal had influenced the probe into the tanker scam that dates back to Sheila Dikshit's tenure as chief minister.
He had alleged that the investigation into the tanker scam was repeatedly delayed and influenced by Kejriwal and "his two men".
Last year in August, Dikshit was "examined" by the ACB officials in connection with her alleged involvement in the tanker scam besides being handed over a set of 18 written questions.
Till some time back, Mishra had been accusing the BJP of shielding Dikshit in the case but last week, he alleged that the AAP government tried to protect her.
The Kejriwal-led AAP government had in June 2015 constituted a fact-finding committee to go into alleged irregularities in procuring some 385 stainless steel water tankers by the DJB.
The Delhi government in June 2016 sent a report of the fact-finding committee to the then Lieutenant Governor Najeeb Jung following which an FIR was registered in the case.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)