Mason Mount's potential return to Stamford Bridge with Derby County looks to be in doubt, after the midfielder has picked up a foot injury.
The young midfielder had been given special permission to play against his parent club on Wednesday by Chelsea, however it looks like injury may rule him out of the EFL Cup tie.
However, Mount, 19, did not last the 90 minutes against Middlesbrough at the weekend and Derby boss, Frank Lampard, was giving nothing away about the player's fitness.
"We'll see," Lampard told the 'Daily Mail'.
"They are Chelsea players and this is an incredible opportunity for them. I don't want to heap it on Mason but his quality, his talent and his work race means he can be very special.
"Even if he is having a game where he can't affect anything, his work rate without a ball is outstanding and that's what picks him out.
"Mason and Fikayo deserve the chance. This is an incredible opportunity for them and they should thank Chelsea and they should thank me for making the calls", Lampard added.
The 40-year-old believes Chelsea are already looking like title challengers under Maurizio Sarri.
"Sarri is very impressive. He has made a great start and made his imprint on the team. see them in a mix of teams like Manchester City, Liverpool and Tottenham this season. It will be a great challenge for my players.'