Fake Blossom Hill has been found on sale in Scotland.
East Renfrewshire Council has investigated complaints about wine labelled as white Zinfandel and, following analysis, found the product to be counterfeit. Further bottles have been discovered in Glasgow.
Tests are continuing to find out whether the liquid is harmful for human consumption.
A council spokesperson said: "Counterfeit products are not linked to the manufacturer of the genuine product, in this instance Diageo and the general public need to be aware that fake or counterfeit products illegally use the name of genuine products and are often of shoddy, or inferior quality."
The counterfeit bottles contain the spelling mistake "Great Britan" on the back label.
A Diageo spokesperson said: "Diageo Great Britain can confirm that it was made aware of counterfeit Blossom Hill product which was purchased from an outlet in Glasgow. We must stress that the liquid in this bottle labelled Blossom Hill White Zinfandel is not genuine Blossom Hill wine.
"The protection of our consumers and reputation of our brands is of paramount importance to us. As such, Diageo works closely to assist all enforcement bodies including the police, HMRC and Trading Standards as we recognise the important and valuable role they have in protecting consumers.
"Counterfeit is rarely a problem if consumers buy their products from known, reputable retailers."