The Belgium midfielder started for Chelsea U21s in their draw with Leeds United.
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Lavia has been missing since suffering a thigh injury in November against Qarabag in the Champions League.
The former Manchester City junior had been training with the first team squad for the past fortnight and was deemed strong enough to start yesterday.
The 22-year-old completed the first 45 minutes before being withdrawn at half-time, putting in a strong showing on his return.