Almost €20,000 euro in cash has been seized at Dublin Port.
The cash was discovered yesterday when Revenue officers stopped a vehicle boarding a ferry to Holyhead.
Today Revenue officers were granted a three month cash detention order at Dublin District Court.
The cash is suspected to be the proceeds of, or intended for use in, criminal activity and is detained by Revenue in accordance with proceeds of crime legislation.
A Polish man in his 30s was questioned.
Investigations are ongoing.
This routine operation is part of Revenue's ongoing work targeting smuggling and shadow economy activity.