The incident occurred at approximately 5am. The victim was a member of the security personal employed at the Irish Rail compound in the area.
The assault occurred when the victim who arrived for work was approached by a number of men who assaulted him and locked him into his car boot before they made good their escape.
The compound is in a rural area and the assailants left the area in a vehicle the make and model of which is unknown at this time. Gardaí believe that there were at least three male assailants.
Anyone who may have witnessed unusual activity in the vicinity are asked to contact Portlaoise Garda Station on 057 8674100 or the Garda confidential line on 1800 666 111 or any Garda Station.