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Olmert, 70, is already facing a jail term of 18 months beginning on February 15 for a separate conviction of bribery.

The plea bargain required Olmert to confess to two charges of obstructing justice in return for the six-month imprisonment for those felonies being served concurrently with the 18 months.

But while Jerusalem magistrates' court justice Avital Chen accepted Olmert's confession and conviction, the decision he issued stated "the court was not committed to the arrangement".

"The default would be consecutive, not concurrent sentences," he said according to a transcript of the court session.

Olmert, who was present in court on Tuesday but did not make a statement, will be sentenced by the magistrates' court on 10 February.

was meanwhile still debating a 19 January appeal by Olmert on a third conviction from May 2015 over fraud and corruption, for which the former premier had been sentenced to eight months imprisonment.

Zaken had recorded him and used the material to win a lesser sentencing for her part in the cases

Olmert's conviction on Tuesday was over trying to persuade his former secretary Shula Zaken not to testify against him in the bribery case and in the fraud and corruption case.

Zaken had recorded him and used the material to win a lesser sentencing for her part in the cases.

His confession to obstructing justice was the first time Olmert had pleaded guilty to any misconduct or crime in his various trials.

The impending 18-month prison term is a reduction of a May 2014 six-year sentence over two separate charges of taking bribes in the early 2000s in connection with the construction of Jerusalem's massive.

His prison term will be the first time a former Israeli prime minister goes to jail.