Mason Mount's Champions League debut for Chelsea was cut short by a horror challenge from Francis Coquelin.
The 20-year-old hobbled off in the 16th minute of Tuesday's Champions League fixture at Stamford Bridge after an awful tackle.
Former Arsenal midfielder Coquelin overran the ball then went in high and rash on Mount, catching him on the side of the shin.
Mount's ankle almost buckled and he tried to play on before falling to the turf again and receiving medical treatment.
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He was replaced by Pedro in the 16th minute and Coquelin somehow escaped with just a yellow card.
Mount's injury will be a huge blow to Chelsea manager Frank Lampard after a flying start to the season from the 20-year-old.
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Chelsea host Premier League leaders Liverpool on Sunday at Stamford Bridge and Mount is now a doubt for that.
He scored late on in Chelsea's 5-2 win at Wolves on Saturday and has been an integral part of Lampard's young side.
But Mount's first start in the Champions League was cruelly brought to an end after just a quarter of an hour against Valencia.
Rodrigo scored the winner for Valencia in the 74th minute as they ran out 1-0 victors at Stamford Bridge.
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Ross Barkley missed a change to equalise from the spot in the worst possible start to the Champions League for Lampard's side.
Featured Image Credit:Topics: Mason Mount, Chelsea, Champions League