Dean Henderson will miss Manchester United's training camp in Scotland after recently contracting Covid-19.
The England goalkeeper had returned to training after recovering from the injury which saw him miss this summer's European Championships.
But he has not felt well since contracting the virus three weeks ago and will not train with teammates in Scotland.
A statement from United read: "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. He is expected to be training soon."