The keeper, who made 26 appearances last term, was forced to withdraw from England's Euro 2020 squad during the tournament due to a hip problem, but he told us last week that he had recovered from that injury.
However, the 24-year-old is still feeling the effects of the virus after initially testing positive a few weeks ago.
“Dean Henderson will miss Manchester United’s Scotland training camp while he continues his recovery from prolonged fatigue after contracting a COVID-19 infection three weeks ago,” the club said in a short statement.
“He is expected to be training again soon.