De Gea, Pogba, Shaw miss Man United training ahead of crucial games vs. Partizan, Norwich
Lingard sat out the draw with Liverpool on Sunday because of a hamstring injury but is in line to feature against Partizan on Thursday after being declared fit enough to return to training.
De Gea played against Liverpool despite suffering a groin injury on international duty with Spain but has been unable to train since.
Pogba had a further scan on a foot problem on Monday but is yet to resume training after missing the last three games.
Shaw has not featured since August because of a hamstring problem while Tuanzebe suffered a hip strain during the warm up ahead of the game with Liverpool.
The squad are set to fly to Belgrade on Wednesday afternoon ahead of their Group L clash with Partizan.
United and Partizan, who who were beaten 1-0 by Mladost Lucani on Saturday, sit top after picking up four points from their first two games.