Junior sport officials are asking clubs and associations to limit as many people at junior and senior sport as possible, with the virus resurging in Victoria and with hotspots breaking out in Sydney.

In a letter to sporting clubs released late on Thursday, NSW chief health officer Kerry Chant on Friday requested people try to stay away unless absolutely necessary, and asking anyone who has visited Victoria or hotspots in Sydney in the previous 14 days to stay home.

People feeling unwell are also not to attend games, and even siblings are asked to have their numbers kept to a minimum.

"Take all reasonable steps to minimise the number of spectators attending community sport events," Dr Chant said.

"These events are so important to the health and cohesion of communities, and so it is imperative that we take these additional steps to protect them at this time."

Junior and senior netball, rugby league, rugby union, Australian rules and hockey all resume over the weekend in the Central West, two weeks after football resumed on July 4, and limiting non-essential attendees applies across the board.

A statement on the Group 10 Junior Rugby League Facebook page reminded parents to have their children arriving "ready to play", and then leave immediately after your game.

About 20 minutes is expected in between each game.

Group 10 JRL president Martin Power said he was encouraging people to stay home if they could.

"We've just got to abide by the restrictions and recommendations put out by the government and NSWRL and make sure we look out for the community," Mr Power said.

"If we all follow the rules we make sure we keep our community safe, and that's what it's all about."

While the league was hoping to have crowds come along as some stage this year, to borrow a sports cliche they'll have to take it one week at a time.

"It was looking good a few days ago, but we've just got to play it by ear."

He said it would be up to clubs to enforce the rules around having as few people as possible attend games, but said he'd spoken with all clubs this week and believed they were prepared for Saturday's games.

NSW Rugby League chief executive David Trodden reiterated Dr Chant's points on Friday, calling for all leagues and clubs to reduce numbers of people in attendance at games.

Competitions in south-west Sydney have been delayed, while Group 7 on the South Coast has postponed the start of its season by two weeks following the announcements.