Ben Chilwell was seen telling Chelsea team-mate Mason Mount that his hamstring "popped" as he was dealt a cruel injury blow on Wednesday night.
The Blues left-back went down in the final minutes of Wednesday's win over Dinamo Zagreb and had to be helped off the pitch. He later left Stamford Bridge on crutches which has cast major doubt over his World Cup hopes with England.
The tournament in Qatar is just weeks away with the Three Lions beginning their campaign against Iran on November 21. Chelsea boss Graham Potter was not optimistic about his left-back's situation after the win in west London, admitting it is a "concern".
