The emails were spammed out over the weekend informing recipients that they have won £500,000 in a special lottery organised by the club to celebrate having £20m left over at the end of the season.
"This email scam campaign is using the name of one of the world's greatest football clubs in an attempt to steal people's money and identities," said Graham Cluley, senior technology consultant at Sophos.
"Everyone should be suspicious if they are unexpectedly told that they have won a fortune. If it sounds too good to be true, it probably is."
In order to claim their prize users have to give their name, address and bank details and are told to expect a cheque forthwith. It is not known how many people have fallen for the scam.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago