A man accused of sexually abusing several children at his wife's nursery school in Moot will appear in the Pretoria Magistrate's Court on Monday.

The man was arrested on Friday, over three weeks after the first charge was laid with police.

Police said they could not arrest the alleged sex offender earlier as they wanted to make sure their case would hold up in court.

It is understood at least four children were sexually assaulted at the nursery school but only two cases have been opened.

A woman who works at the school was also arrested after she allegedly showed pornographic material to children on the premises.