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Manchester United and Liverpool is one of the fiercest rivalries in world sport, never mind just football.

Its roots lie in the construction of the Manchester Ship Canal, which funnelled trade away from the Liverpool docks and into the neighbouring city. But its bitterness deepened and darkened over more than 100 years of blood, sweat and tears at Old Trafford and at Anfield, the two clubs rising to the very pinnacle of the beautiful game to create a contest all of their own.

Liverpool entered the 90s on top with 18 league titles, but by the time of his retirement Sir Alex Ferguson had made good on his promise to knock the Scousers off their perch with the Red Devils sitting pretty on 20.

The Merseyside outfit equalled that feat in Arne Slot’s debut season, and while United are staring down the barrel of falling behind in the greatest of races with their greatest of enemies the fires of the rivalry will only burn hotter.

With all of this in mind, it’s no surprise that only a handful of players have been brave enough to represent both teams – those players are as follows: