It is understood that the Criminal Assets Bureau has told former lobbyist Frank Dunlop that he will be charged with corruption.
At Trinity College today, where he was conferred with a law degree, Mr Dunlop refused to comment on the charges.
Although Mr Dunlop's testimony at the Mahon Tribunal cannot be used against him, it is understood that he made a number of statements under caution to members of the CAB in 2004, which can be used in a court of law.
The rezoning of land at Carrickmines in south Dublin in 1997 is understood to be the basis of a prosecution against Mr Dunlop.
Mr Dunlop told the Mahon Tribunal he paid £25,000 in bribes to nine councillors during attempts to get rezoning for part of lands owned by the company Jackson Way.
The CAB got a High Court order two years ago freezing 107 acres owned by Jackson Way on the basis that their value had been corruptly increased by €53m.
Mr Dunlop claimed he did this on behalf of businessman Jim Kennedy who is believed to be one of the beneficial owners of the lands.
Mr Dunlop could face a maximum prison sentence of seven years if charged with corruption.
It is not known if any of the councillors he named are to be charged.
