The Danish midfielder, who has an ICD device after his Euro 2020 collapse, faces risks if his heart rate spikes.
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A fever earlier in the week further complicated matters, leading to his omission from the squad in the 1-0 defeat.
Pre-game, Amorim said: "Chris (Eriksen) has the heart situation and we have to be really careful with that - it’s nothing about the heart!
“I’m just saying the heart rate has to be controlled because he has a fever."
United lost the game against Eriksen’s former club 1-0, going down to a James Maddison goal.