Giuliani said Mueller's team will be following Justice Department's the guidance, Xinhua news agency reported.
The precedent that federal prosecutors cannot indict a sitting president is laid out in a 1999 Justice Department memo, but it has never been tested in court.
An absence of an indictment would not necessarily mean that Trump is in the clear.
Mueller could submit a report making referrals or recommendations to the House of Representatives, which could decide what to do about the report and whether to pursue articles of impeachment.
During his interview with CNN, Giuliani also said that he will use the Mueller probe's one-year mark, which is Thursday, to rachet up pressure on the investigation.
The year-long investigation is looking into alleged links between the Trump campaign and Moscow, Russian interference with the 2016 US presidential election, and whether Trump asked Comey to end the probe into former national security adviser Michael Flynn, among other things that would arise from the investigation.
Trump has repeatedly denied allegations of collusion, describing the Russia probe as a "hoax" or a "witch hunt".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)