Jose Mourinho has built a partition around the first-team changing area at Manchester United's Carrington training ground to keep them separate from other players.
United's original open-plan dressing room has had doors and glass windows installed to prevent anyone walking through the first-team section on their way to the gym or other parts of the complex.
Mourinho wants to keep his senior squad as a tight-knit group and does not want any dissatisfaction from outsiders proving a distraction.
The manager told eight players, including Bastian Schweinsteiger, Adnan Januzaj and Andreas Pereira, to train with the Under-21s until they moved to other clubs.