Antonio Rudiger, Ethan Amapdu, Danny Drinkwater and Marcos Alonso were all missing from Chelsea’s training session ahead of their second leg clash with Slavia Praha.
Dominic Fifield reports that the four players were not present as Maurizio Sarri put his squad through their paces ahead of the game on Thursday night.
Chelsea are training on Wednesday afternoon as they prepare for the second leg, in which they hold a narrow 1-0 advantage.
It was Alonso who scored the only goal of the game in the first leg, but it now looks like Emerson could be given the nod on Thursday.
Rudiger was not expected back in training, while Drinkwater continues to watch on from the sidelines this season.
Gary Cahill was said to be present at training and now looks like he could be given a run as Chelsea look to book a place in the semi-finals of the Europa League.
Big decisions Sarri has to make ahead of Thursday's clash
Stick with Kepa?
Sarri has refused to rotate between the sticks during the Europa League this season and that looks unlikely to change in the near future.
Does he trust Cahill?
Gary Cahill looks like he could finally get his break at Chelsea this season as a result of Rudiger’s injury. Possibly his final appearance in a Chelsea shirt?
What to do at left-back?
Emerson looks like he could be forced to start at left-back and Sarri will be eager to manage his fitness carefully ahead of Chelsea’s run-in.
Revert to Giroud?
Giroud has been Chelsea’s striker in the Europa League for the most part, but the Blues went with a false nine against Liverpool on Sunday. To some extent, it worked, but the Blues will need more attacking threat on Thursday night.