Rana, who has appealed against his detention and was making renewed efforts to be freed on bond, appeared before US District Judge Matthew Kennelly in the US District Court, Northern District of Illinois here.
But the prosecutors said they expect to obtain an indictment against Rana, under investigation for possible links to 26/11 terror attacks, by January 14. After the indictment, Rana's case could be handled by a different judge.
Then judge Kennelly said since he was not certain he would continue to be in charge of the case after the indictment, he would not act on Rana's bail request just yet.
He set a status hearing for January 21.
Assistant US Attorney Daniel Collins told Kennelly that the government has no plans to request more time to obtain an indictment against Rana, who is custody since October 18.
A Chicago court had in November last year given a 58-day extension to the FBI to file indictment against Rana by January 14.
Rana, 48, appeared in court wearing an orange jumpsuit for the hearing that lasted only a few minutes.
After the judge said he would not yet decide on his bail plea, Rana was escorted by marshals to the Metropolitan Correctional Center.
Rana, who has been in custody since October, was denied bail by US Magistrate Judge Nan Nolan last month who said there was risk he might flee the country if released on bond to escape a possible 30-year jail term.
Rana may use his financial resources and knowledge in immigration law to flee the country, Nolan had said.
Kennelly was serving as the court's emergency judge over the holidays and for now, his case was still before him.
Rana's attorney, Patrick Blegen, has said if asked, Rana would deny the charges against him.
Rana, along with Pakistani-American David Coleman Headley, has been charged with plotting an attack against a Danish newspaper. The FBI has also filed charges against Headley for conspiring in the 26/11 Mumbai terror attacks that killed about 170 people.
Headley allegedly made several trips to India scouting for targets for the attack and then shared the information with conspirators in Pakistan, and FBI alleges that Rana "knew in advance" of the 2008 Mumbai attacks and even "complimented" terror group Lashkar-e-Toiba for the attacks.
Rana has been not charged with any crime in connection with the Mumbai attacks.
Meanwhile, some media reports here said Rana may use 'deserter defense' in court in his renewed effort to be freed on bail. Rana may contend that he deserted the Pakistani military and is persona non-grata in his homeland.
Since he cannot return to his native Pakistan, where he could be arrested, the judge should allow him out on bond in his terrorism case as he "promises not to flee".