Villa manager Emery knows his side must tighten up to remain competitive with the top clubs in the division and explained that a clean sheet is the first step to winning. Without a victory in over a month, Villa face Chelsea on Sunday and Emery was asked why his side's defensive record in Europe is so much better than in the league.

Unai Emery is the most methodical of managers - the return to fitness of Kamara has come at a good time for Aston Villa