Panache Beverages says it is involved in the development, sales and marketing of spirits brands.
Last year McKillen said he had exploited his distribution networks from his days with 42 Below to establish VnC in 30 markets around the globe.
At that time he said VnC had exported 120,000 cases of product in the 12 months to March 2011, valued at about $10 million.
In a statement issued by Panache Beverages in the US late last night, McKillen said VnC was "very excited" to be engaged in acquisition discussions with the American company.
McKillen and Panache Beverages chief executive James Dale were formerly in partnership as the US importer of 42 Below.
That partnership ended following the vodka firm's sale to Bacardi, the statement said.