Chief Judicial Magistrate Jatin Thakkar extended Sai's police custody by five days as police said Sai's associates had tried to bribe authorities to dilute the case against him.
Public Prosecutor Nayan Sukhadwala submitted further custody was required to find out how he had conspired to bribe police, doctors and judicial officers to weaken his case. Police have detained six people, including a police sub-inspector, in this connection.
Police also sought Sai's remand to question him about the cellphones, pen drives and SIM cards recovered during the investigation so far.
He, however, did not seek further remand of Sai's aide Kaushal Thakur alias Hanuman. The court sent him in judicial custody.
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Sai and two of his aides were arrested by Delhi Police on December 3 from Delhi-Haryana border.
Two Surat-based sisters have accused Sai and his father and controversial godman Asaram Bapu of rape. The elder sister has levelled allegations against Asaram and the younger sister has levelled allegations against the son.