The drink is available in a 25cl can and has an abv of 4.5%.
The move comes on the back of strong growth for the canned premix spirit-mixer category in multiple grocers, led by a range of products from Diageo.
John Bradbury, off-trade sales director at W&M, said: “W&M are constantly looking at ways to help our customers increase sales.
"Having whisky ready mixed means that consumers who wish to only have one drink can do so without opening a large bottle of coke which may then go flat. The 25cl cans size also means that they are an ideal size for chilling and storing in the fridge."