The incident took place in the early hours of Saturday morning.
Gardaí in Navan are investigating a serious assault that occurred at approximately 3am on Saturday morning at Watergate Street.
A 21-year-old man received serious injuries and was taken to Our Lady of Lourdes Hospital in Drogheda. He has since been transferred to Beaumont Hospital in Dublin.
His condition has been described as critical.
The scene in Navan has been preserved and a Garda Technical examination has taken place.
Gardaí are appealing for anyone who was in the Watergate Street area between 2.45am and 3.30am and who may have witnessed the assault, or any motorists who may have passed through the vicinity and have dash cam footage, to contact Navan Garda Station on 046 903 6100.
Alternatively, people may contact the Garda Confidential Line on 1800 666 111 or any Garda Station.
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