Jamie Oliver Restaurant Group chief executive Jon Knight said the partnership would give it the opportunity to expand its presence geographically.
Oliver has had to put £3m of his own money into the company, as well as closing 12 United Kingdom restaurants in order to keep trading.
Jamie's Italian Canberra has closed suddenly, with the Canberra Centre restaurant not opening on Monday and the phone disconnected.
The company operated six Jamie's Italian branded restaurants across Australia, after Oliver purchased the brand back from collapsed former operator Keystone Hospitality Group in November 2016.
The chef's Jamie's Italian site in Canberra has shut its doors after it was sold alongside the remaining five restaurants to Brisbane-based Hallmark.
In March, the chief executive of the United Kingdom business said the company had struggled because it had "rested on its laurels" as more quick service retail businesses entered the British market.
Both Fairfax and the ABC reported that a statement from the Jamie Oliver Restaurant Group had confirmed the closure "with immediate effect".
The move comes just weeks after Oliver's Barbecoa went into administration.
The UK branch of the Jamie's Italian chain has also been forced to close several stores in the UK, while others are operating with reduced rents after creditors approved a company voluntary arrangement (CVA) earlier this year.
Oliver's businesses are not only struggling to make ends meet overseas.