The chief executive officer of Dublin Port has said he believes any barriers introduced at ports in Ireland will be at a manageable level in the event that border checks are re-introduced following Brexit.

Eamonn O'Reilly said he took great solace from the numbers of appointments of new customs staff and inspectors announced by the Taoiseach yesterday.

Leo Varadkar said that Ireland will have to hire about 1,000 new customs and veterinary inspectors by 2021 to prepare our ports and airports for Brexit.

He said that due to the "growing uncertainty" over whether British Prime Minister Theresa May will get a withdrawal agreement through Westminster, Ireland needs to "up our preparations when it comes to Brexit".

Mr Varadkar said this includes preparing Irish ports and airports for a change in the rules of the trade east-west between Britain and Ireland in January 2021.

Speaking on RTÉ's Morning Ireland, Mr O'Reilly said he is not concerned about the type of Revenue inspections needed at Dublin Port, as they already exist, but need to be scaled up.

He said that a background industry of administration and overhead will need to re-invent itself to deal adequately with the Revenue Commissioners and the Department of Agriculture, Food and the Marine.

Mr O'Reilly said primary inspection facilities will be built for secondary checks on freight trucks.

He also said that he does not foresee long tailbacks of trucks as a result of extra checks.

However, he said that 950,000 units of freight trucks in Ireland will potentially be affected by any new rules introduced in Dublin and Rosslare.

Speaking on the same programme, Minister for Social Protection Regina Doherty recruitment for new airport and port staff would begin in September.

When asked what would happen to the new airport and port staff if the UK opted to remain within the Customs Union, the minister said that the UK has made it very clear that it does not want to stay in the Customs Union and that that is the direction the White Paper is going.