Walter Van Steenbrugge said the legal action would be initiated in May.
Sex abuse scandals in the Catholic church have been reported in several European countries - including Belgium, Germany and Ireland. Pope Benedict XVI issued an apology in March 2010.
The Belgian church was embroiled in a major sex abuse scandal last year when Bruges bishop Roger Vangheluwe was forced to resign after he admitted he molested one of his nephews for 13 years.
In an interview to TV station VT4, Vangheluwe, now 75, also admitted having sexually abused another nephew.
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