Three teams in Group D have United representation, with Christian Eriksen, Raphael Varane and Hannibal picked in the squads of Denmark, France and Tunisia respectively.
Over in Group H, a Portugal side containing Diogo Dalot, Bruno Fernandes and Cristiano Ronaldo will come up against Facundo Pellistri's Uruguay on the second matchday.
That's not even mentioning the potential for knockout clashes, which dominate the previous eight instances of United players meeting on opposing World Cup sides...
Denmark 1 Scotland 0 (1986)
The first-ever head-to-head between two United team-mates at a World Cup took place at Mexico 86, as Gordon Strachan and Jesper Olsen faced off, with Arthur Albiston watching on from the stands and John Sivebaek on the Denmark bench.