Canada's Saputo, which last year bought Australian co-op Murray Goulburn, is eyeing up New Zealand's second biggest dairy co-op, Westland Milk, the Australian newspaper reported.
The paper said Saputo was also only vying for parts of Australia's Lion Drinks and Dairy.
The paper said Westland would offer Saputo a stronger foothold in the New Zealand market to take on industry giant Fonterra.
Westland has 429 farmer-shareholders.
The Australian said Macquarie Capital is working on the sale.