Father Nicola Corradi is already known for alleged abuse committed at a school for the deaf in Verona.
A spokesman for the Mendoza bishopric said Corradi, who arrived there in 1996, may have been a beneficiary of the former "malpractice" of shifting predator priests from one place to another rather than denouncing them.
An Italian non-profit organisation, Rete L'abuso Onlus, has denounced Corradi's abuse in Verona to the local Church, the Vatican and the UN, demanding the creation of a commission of inquiry into Italian paedophile priests.