The Christian Bothers say they're "enormously disappointed" to learn the board of Clonkeen College is taking legal action over the sale of the school's playing pitches.
The religious order wants to sell 7 and a half acres of land at the Deansgrange school to a local developer.
The sale is aimed at raising millions of euro money owed to a compensation fund for survivors of clerical sex abuse.
However parents, teachers and local politicians have slammed the move saying green spaces are vital for the health of the students.
The school's principal Edward Melly has previously accused the Christian Brothers of reneging on an agreement, saying the school was assured it would have use of the pitches for as long it needed them.
Last month the Education Minister told the Dail that contracts had been signed and the sale could not be reveresed.
However the Board of Management insists it's not a done deal and the sale can be stopped.