Armando Broja appears to have sustained a damaging injury after being substituted off against Aston Villa in a mid-season friendly.
Chelsea are currently playing against Premier League opposition in Abu Dhabi and Broja started the game in attack alongside Pierre-Emerick Aubameyang but remained on the ground after a collision with Ezri Konsa and screamed in pain.
The Blues were 1-0 down when Broja contested a ball in the Villa area but immediately fell to the ground and remained down for several minutes before being stretchered off.