Three of Ruben Amorim's first-team squad are playing for Denmark - Patrick Chinazaekpere Dorgu, Christian Eriksen and Rasmus Hojlund.
Dorgu is available for the Reds again upon his return, after serving the final match of this three-game domestic suspension in the 3-0 away win at Leicester City on Sunday.
Hojlund heads into the two-legged UEFA Nations League quarter-final ties with Portugal in good heart, after notching his first goal of 2025 to open the scoring at the King Power Stadium.
Of course, Portugal have two United men in their squad for the fixtures - Diogo Dalot and Bruno Fernandes, who combined for the third strike against the Foxes.