Chelsea manager Enzo Maresca says he hasn't seen either Raheem Sterling or Axel Disasi since the season began and they will remain in the "bomb squad".
The Italian confirmed the pair will continue to use a different pitch, gym and dressing room from the rest of the first-team squad indefinitely.
Neither forward Sterling nor French defender Disasi was able to secure a move away from Stamford Bridge before the end of the transfer window.
Maresca, whose Chelsea side visit Brentford in the Premier League on Saturday, said: "They are Chelsea players, but at the moment they are training separately and the plan is to continue in this way.
"Since the season started, I haven't seen either of them. I haven't seen Axel or Raheem. They train at a different time and on a different pitch. I haven't seen them since the start of the season."