The contracts were given when Lalu Yadav was railway minister. Mr Yadav, who was summoned by the CBI for the second time to appear before the investigating team, sent his lawyer who submitted the request seeking two weeks time for questioning, the CBI sources said.
They said the agency was processing the request and would take a call on future course of action.
The lawyer did not say anything about Tejashwi Yadav, the RJD leader's son and former deputy chief minister of Bihar, who is summoned in the case tomorrow, they said.
They had been called on September 11 and 12. Lalu Yadav did not turn up, citing an ongoing court case in Ranchi where his presence was required, while Tejashwi claimed he had political commitments to take care of.
The FIR alleged that the RJD leader, as the railway minister, abused his official position for extending undue favours to the Kochhars and acquired a "high value premium land" through a benami firm Delight Marketing Company. As a quid pro quo, he "dishonestly and fraudulently" managed award of leasing of the two hotels.
The CBI has registered the case against Lalu Yadav, his wife Rabri Devi, a former Bihar chief minister, son Tejashwi, who was deputy CM until a few months ago, and Sarla Gupta, wife of Prem Chand Gupta, a former union minister.
Others named as accused in the FIR include Vijay Kochhar, Vinay Kochhar, both directors of Sujata Hotels and owner of Chanakya Hotel, Delight Marketing Company, now known as Lara Projects, and then IRCTC managing director PK Goel.