Chelsea manager Enzo Maresca says Jadon Sancho "could do better" but insists it is "not the moment" to discuss the player's future.
His comments follow reports the forward could return to Manchester United once his loan spell with the Blues is over at the end of the season.
The 25-year-old winger joined Chelsea on loan with a £25m obligation to buy but it has since emerged that there is a £5m penalty clause if they opt against signing him.
Sancho has scored just twice in 29 games since joining Chelsea and is on an 18-game goal drought in all competitions.