Maurizio Sarri has demanded a reaction from his Chelsea players when they travel to Watford on Boxing Day .
Jamie Vardy scored the only goal to stun the Blues on Saturday and send Leicester City away from Stamford Bridge with a surprise 1-0 win .
Sarri was angered by Chelsea's lacklustre reaction to falling behind 10 minutes into the second half against the Foxes and knows they must improve at Vicarage Road, where his predecessor Antonio Conte suffered a damaging 4-1 defeat last season.
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"I think that in this moment we have to think about us, only about our team," said the former Napoli coach.