But mosques and Catholic churches in Wollongong, have banned gatherings of more than 500 people, in line with government directives to slow the spread of COVID-19.

Omar Mosque chairman Dr Munir Hussain said the Gwynneville-based mosque will have shorter prayer gatherings, reducing exposure by about 10 to 15 minutes.

"We will also close the mosque after this and we've told the elderly to stay at home," Dr Hussain said.

The rest of the Muslim community has been advised to "pray at home" from Friday instead of at a mosque.

Prime Minister Scott Morrison on Friday announced all non-essential large gatherings be suspended from Monday.

Churches were advised to consider holding extra services to keep numbers under 500.

The Diocese of Wollongong Office of the Bishop told the Mercury parishioners have been informed that if they are unwell, caring for someone who is unwell, or feel they are vulnerable to COVID-19, they should not physically attend Mass.

"Parishioners who do not attend Mass can honour their Sunday obligation in other ways, such as by participating in a time of prayer within the home, reading the Scriptures or watching Mass on television or online," the spokesperson said.

"As the COVID-19 situation continues to evolve, the Diocese of Wollongong is exploring ways in which it can further support parishioners and clergy to stay healthy and safe while participating in parish life and other church activities.

"We will continue to provide regular updates as new information becomes available."

Read more: Illawarra parents speak out on school measures as TIGS sets COVID-19 plan

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