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Two shopping centres and a Big W store have closed after customers tested positive for coronavirus as New South Wales teeters on the brink of a second wave.

Cabramatta Plaza in western Sydney, Vanity Nails in Carlingford Court in Sydney's north-west and Big W at Carnes Hill Marketplace in the city' south-west all closed on Monday to all undergo a deep clean following exposure to COVID-19. 

The locations are among 40 venues and businesses around the state linked to coronavirus cases.

Cabramatta Plaza (pictured) in western Sydney, closed after a customer tested positive for coronavirus

Carlingford Court (pictured) in Sydney's northwest has undergone a deep clean after a customer tested positive at one of its stores

New South Wales has recorded 40 venues and businesses linked to coronavirus cases 

A customer tested positive for COVID-19 at Cabramatta Plaza on Monday after visiting a doctor's surgery and pharmacy.

Vanity Nails in Carlingford Court was closed on Monday for a deep clean after a customer who visited the store on July 18 between 9am to 10.30am tested positive for COVID-19.

'The team at Vanity Nails is continuing to work closely with the NSW Health, and, as a precautionary measure, the store will be thoroughly cleaned and sanitised overnight,' a statement read.

'We have also increased our cleaning roster since learning of the case, with additional focus on specific areas including handrails, toilets, door handles, sinks, change tables and parents' rooms, as well as communal furniture throughout the centre. 

'This will continue for the foreseeable future.' 

Another infected customer visited Big W at Carnes Hill Marketplace on July 14 about 4.20pm for approximately 20 minutes, causing the store to be closed for cleaning.  

'Our best wishes are with this customer for a speedy recovery,' Carnes Hill Marketplace wrote on Facebook. 

The store is expected to reopen for trade as normal on Tuesday. 

Any customer who attended the Big W after 4pm and presents with symptoms is urged to get tested for COVID-19 and self isolate.   

Vanity Nails was closed on Monday for a deep clean after a customer who visited the store on July 18 between 9am to 10.30am tested positive for COVID-19

A customer who visited Big W (pictured) at Carnes Hill Marketplace on July 14 about 4.20pm for approximately 20 minutes, closed on Monday to be thoroughly cleaned 

New South Wales recorded 20 new cases on Monday - three of which are linked to the Crossroads Hotel in Casula in the city's south-west, bringing the total number of cases linked to the cluster to 48.

Four of the new cases are linked to the Batemans Bay Soldiers Club on the NSW South Coast - bringing the cluster to eight. 

A worker, two diners and a close contact of a case were linked to the venue on Sunday. Four cases who dined at the club were previously reported and the venue has been closed for two weeks for deep cleaning.  

There are now 40 venues and businesses around the state linked to coronavirus cases. 

Premier Gladys Berejiklian said on Monday she was 'incredibly concerned' and that NSW was at a 'critical point' in the pandemic.

She said it was positive all the new cases were from known sources but urged people to 'please consider avoiding crowds'.

'If you cannot guarantee social distancing where you're going, if you cannot guarantee people around you will respect that social distancing, you must wear a mask.'

'We do have the chance to really get ahead of the virus, to control the spread if all of us take those extra steps this week.' 

Ms Berejiklian last week said she would avoid a second lockdown 'at all costs' to protect jobs - but on Monday she said: 'You never say never in a pandemic'.

The state's total of 20 new cases is the highest since 21 cases on April 29.   

Premier Gladys Berejiklian said on Monday she was 'incredibly concerned' and that NSW was at a critical point in the pandemic

Four of the new cases are linked to the Batemans Bay Soldiers Club - bringing the cluster to eight

Another eight cases are now associated with the Thai Rock restaurant at Stocklands Wetherill Park in the city's western suburbs. 

NSW Health confirmed a new case has been linked to Paddington's The Village Inn, in the inner city.

Anyone who visited the pub between 6.30pm and 10pm on July 11 has been told to monitor for symptoms. 

The nearby Love Supreme Italian restaurant was also visited by a confirmed coronavirus case. 

Health officials have advised any patrons who visited the restaurant between 5.30pm and 9pm on July 14 to monitor for symptoms. 

Anyone who dined at Holy Duck! restaurant in Chippendale, in the inner city, on July 10 between 7.15pm and 9.30pm has also been asked to immediately self-isolate.

An infected person visited Anytime Fitness Gym in Merrylands, in Greater Western Sydney, on July 14 from 9pm to 10:30pm.

Anyone who visited the gym is also advised to self-isolate and watch out for symptoms. 

On July 15 a COVID-19 case visited McDonald's at Albion Park, near Wollongong, between 2pm and 2.30pm.

Another infectious customer attended family restaurant Rashays in North Wollongong between 7pm and 9.30pm on July 11.

Campbelltown, in southwest Sydney, is home to an outbreak of cases across several venues. 

New South Wales recorded 20 new cases on Monday - three of which are linked to the Crossroads Hotel in Casula, bringing the total number of cases linked to the cluster to 48. Pictured: people queue at a drive-through COVID-19 testing facility at the Crossroads Hotel

New South Wales recorded 20 new cases on Monday. Pictured: Young shoppers wear face masks in Pitt Street Mall on July 20

A COVID-19-positive patron attended the Macarthur Tavern in Campbelltown on Saturday July 11 between 9pm and midnight.

The nearby Wests Leagues Club Macarthur shut for deep cleaning last week after a person who tested positive for coronavirus visited the club while infectious. 

The infected person went to the club in Leumeah on Friday July 10 at 8pm and on Sunday July 12 between 12am and 2.30am. 

Picton Hotel, in Sydney's southwest, closed for cleaning last week after a patron tested positive for COVID-19.

The patron tested positive after visiting the Crossroads Hotel on July 3.

They also attended the Picton Hotel during their infectious period, using the gaming room on July, 4, 9 and 10. 

NSW Health confirmed a case has been linked to Paddington's The Village Inn, in Sydney's inner city

NSW Chief Health Minister Kerry Chant said anyone who visited Narellan Town Centre's Kmart, Target, Best and Less, H&M and the food court on July 6 should look out for symptoms.

The coronavirus-positive customer attended the shopping centre between 7pm and 9.30pm on July 11.

The virus has spread further south to Bowral, in the Southern Highlands, where a Woolworths worker tested positive. 

The employee was not symptomatic when they worked on Sunday July 12.    

It comes as NSW will from midnight on Tuesday enforce tougher border restrictions for people wanting to enter the state from Victoria.

A border zone will be set up along the Murray River, with criteria for cross-border travel to be tightened.

All current travel permits will be cancelled and residents in the border zone who wish to move between the states will have to reapply.

Travel will only be allowed for work, education or for medical care, supplies or health services.