CBI judge Shiv Pal Singh directed senior RJD leaders Raghuvansh Prasad Singh, Shivanand Tiwari and Lalu Prasad's son Tejashwi Yadav and Congress leader Manish Tewari to personally appear before the court on January 23.
Tejashwi Yadav is leader of opposition in the Bihar Assembly.
The court which was scheduled to pronounce the quantum of punishment to Lalu Prasad and 15 others today is likely to announce it tomorrow, a CBI advocate said.
The case did not come up today due to a condolence meeting held during the day to mourn the death of two lawyers, he said.
The court had on December 23 convicted Lalu Prasad and the other 15 in a fodder scam case, 21 years after it had surfaced. Six others, including another former chief minister, Jagannath Mishra, were acquitted.
The case pertains to fraudulent withdrawal of Rs 89.27 lakh from the Deoghar Treasury between 1991 and 1994.