Frank Lampard has told Callum Hudson-Odoi he must match Willian and Christian Pulisic's form to start for Chelsea, while also confirming N'Golo Kante's injury.
Influential midfielder Kante is set to be sidelined for the Champions League-chasing club's matches against Crystal Palace and Sheffield United because of a hamstring issue.
Lampard, speaking ahead of Palace on Tuesday, also warned Hudson-Odoi he will only start for Chelsea when he proves he is worthy of the place.
'He needs to work hard daily in training and when he gets his opportunities really show input in games,' Lampard said of the 19-year-old.