10 players have represented both eternal rivals Manchester United and Liverpool.
When it comes to rivalries, there are very few that can match the intensity and extent of animosity between Manchester United and Liverpool.
Despite the footballing rivalry between the two Northern powerhouses, there are some players who actually played for both clubs in their career.
GOAL takes a look at the a list of stars who have been part of both clubs.
Fred Hopkin
Hopkin joined Manchester United in 1919 and scored eight goals in 41 appearances in his first season at the club.
After a rather underwhelming 1920-21 season, Hopkin joined Liverpool for £2,800 in May 1921, and went on to make 360 appearances for them over the next decade.
In less than a year after joining the Merseyside club, Hopkin celebrated a league title in his first season at the club, followed by a repeat of the same in the next season.
AdvertisementTommy Reid
Scottish centre-forward Tommy Reid was brought to England by Liverpool in 1926, with the Reds paying a fee of £1,000 to sign him at that time.
Reid spent three seasons at Liverpool, scoring 30 goals in 55 appearances before joining Manchester United in January 1929.
He spent just over four seasons at United which turned out to be the best goalscoring years of his career as he netted 63 goals in just 96 appearances for the Red Devils between 1929 and 1933.
Tom Miller
One of the great Scottish strikers in the the late 1920s and early 1930s, Tom Miller was signed for Liverpool in 1912 by manager Tom Watson.
His career, along with the rest of the footballing fraternity at that time, was interrupted during the World War I and he returned to Liverpool in 1919. Between 1912 and 1920, Miller scored 56 goals in 146 appearances for the Merseyside club.
Bitter rivals Manchester United signed Miller in September 1920 and played for the Red Devils for one season.
Tom Chorlton
Another Tom Watson signing, this time in 1904, Tom Chorlton took some time to establish himself as a starter at Liverpool.
In the 1909-10 season, Chorlton didn't miss a single game for Liverpool becoming the only player to achieve that feat.
An expert penalty taker, he scored eight goals in 121 games for the Merseyside giants before joining Manchester United in 1912. Over the next two years, he could make just four appearances at Old Trafford.