It had been expected that the troops would serve there for at least another year, but the Chadian authorities have indicated that the UN force is no longer needed.
400 Irish troops have been on four-month tours of duty in Chad for the past two years.
They were initially part of a European operation, called EUFOR, which was commanded by a senior Irish officer, Lt Gen Pat Nash.
One of their tasks was to protect refugees who had fled the unrest across the border in Darfur.
Last March, the UN took control of the mission and started to pay most of the bills.
The deployment of Irish soldiers to land-locked Chad had been a huge logistical feat. All their heavy equipment and facilities had to be shipped from Ireland to the port of Dualla in Cameroon and taken 1,500 miles inland on dirt-track Chad.
Chad President Idriss Deby now saysthat UN troops are no longer needed as the situation has stabilised.
The Irish Government is expected to decide on whether to go or stay within the next few weeks.
Military engineering specialists are on stand-by to dismantle the Irish camp if a decision to withdraw is taken.
If the peacekeepers are ordered home, it would mean that only about 80 soldiers would be serving abroad - the lowest number in decades.
About 150 peacekeepers are also being withdrawn from the Balkans shortly. There is provision for 850 troops be be abroad at any one time.
