Former politician Ivor Callely could face another term in jail for breaking a court order forcing him to pay a debt to an accountancy firm.

The ex-Fianna Fáil politician and junior minister was jailed for five months in 2014 for using false invoices to claim Oireachtas expenses of €4,207.45 between November 2007 and December 2009 while he was a member of the Seanad.

However the Dublin District Court heard today that Callely has failed to comply with terms of a 2013 court judgment compelling him to pay a €1,755 debt to Galway-based accountants Gallagher & Company.

The firm asked the judge to issue a committal order.

The 2013 ruling included an instalment order stating Callely had to pay €100 a month to clear his debt.

Solicitor Paula McHugh acting for Gallagher & Company said Callley had not made contact with the firm since the ruling nor had he notified them of a change of address.

The firm is also seeking to increase the amount owed by €150.

Ms McHugh said the extra amount was a result of expenses from hiring a private investigator to establish the whereabouts of Callely, who also spends time in Northern Ireland.

Callely, who claims he has needs of €2,500 a month "for a reasonable living", said he had done his best to contact the creditor but Judge Michael Coghlan told him he was in contempt of court orders.

Threatening to jail the former senator and TD, the judge said he was not impressed with his evidence and wanted to see proof of his income and expenditure.

He gave Callely a "formal warning" that he would issue the committal order if Callely does not provide the court and the creditor with adequate information in advance of the next hearing.

Judge Coghlan adjourned the case for four weeks.