Jose Mourinho has warned his Chelsea stars they must develop a ruthless streak after the Blues fell to their first Premier League defeat since the manager's return.
Chelsea's Portuguese manager Jose Mourinho watches the action during the English Premier League football match between Everton and Chelsea at Goodison Park in Liverpool, northwest England on September 14, 2013. Everton won 1-0.
Mourinho was left to rue his team's failure to convert chances at Goodison Park on Saturday as Steven Naismith earned Everton a 1-0 win with a goal on the stroke of half-time.
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