ATLANTA — A Georgia judge said on Monday that he would disclose parts of a grand jury report later this week that details an investigation into election interference by former President Donald J. Trump and his allies, though he would keep the jury’s recommendations secret for now.

In making his ruling, the judge, Robert C.I. McBurney of Fulton County Superior Court, said the special grand jury raised concerns in its report “that some witnesses may have lied under oath during their testimony.” But the eight-page ruling included few revelations about the report, the contents of which have been carefully guarded, with the only physical copy in the possession of the district attorney’s office.

For the last two years, prosecutors in Atlanta have been conducting a criminal investigation into whether Mr. Trump and his allies interfered in the 2020 presidential election in Georgia, which he narrowly lost to President Biden. Much of the inquiry was conducted before a special grand jury, which in Georgia makes charging recommendations in a final report.

It will be up to Fani T. Willis, the local district attorney, to decide what, if any, charges she will bring to a regular grand jury. Judge McBurney said he would release portions of the report on Thursday, including the introduction, the conclusion and the part detailing the grand jury’s concerns about witnesses lying under oath.

At a hearing last month, a coalition of news organizations asked the judge to make the report public. But Ms. Willis sought to keep the grand jury’s findings secret, at least ahead of her charging decisions, saying during the hearing that she was “mindful of protecting future defendants’ rights.”

Nearly 20 people known to have been named targets of the criminal investigation, as well as others, could face charges, including Rudolph W. Giuliani, Mr. Trump’s former personal lawyer, and David Shafer, the head of the Georgia Republican Party.