The new Blues midfielder joined the club from Southampton for £58million this summer after they hijacked his transfer to Liverpool
But he is yet to step on to the field and make his debut for his new side.
And now the Belgian star could potentially spend a period on the sidelines.
That is because he has damaged his ankle, hurting himself during a session at Cobham this morning.
It is understood Lavia was forced to quit training and return inside to be treated.
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