The move comes after the Postal Order pub in Crystal Place was vandalised with red and white graffiti – which the pub chain condemned.
“No-one has the right to vandalise one of the company’s pubs,” a spokesman said.
The government has said it will pay 80% of salary for staff who are kept on by their employer, covering wages of up to £2,500 a month.
Mr Martin had come under pressure from 95 MPs who signed a petition for him to pay his workers.
Ian Hodson, president of the British Food and Allied Workers Union, had accused Mr Martin of “ignoring the advice of government to stand by” his workers.