Police arrived at about 2:30am with a photograph of the individual and asked staff to review video footage to confirm if the man had stepped inside.

The footage confirmed that the man walked in at about 11:10pm on Tuesday. Police told staff to shut the store down.

Manager Paraveen Manne said one staff member was a close contact and would be tested today.

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"He went into quarantine and would have to isolate for 14 days," he said.

"He was wearing a mask, but at the most he spent about 10 to 15 seconds in the store, paid with EFTPOS and left."

Staff were told by police that he allegedly resided in Liverpool but was living with a relative in Mittagong.

Mr Paraveen confirmed that another staff member was in the store at the time and has since isolated, but was not considered a close contact.

The station re-opened at 11am this morning after it was deep-cleaned twice.

NSW South Western Sydney Local Health District was contacted.

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