Manchester City manager Pep Guardiola was frustrated by his side's profligacy in Saturday's 1-0 victory at Southampton and has warned his players they must develop a killer instinct in front of goal if they are to mount a successful title challenge.
Raheem Sterling gave City an early lead at St Mary's but Kevin de Bruyne, Bernardo Silva and Riyadh Mahrez all missed gilt-edged opportunities to drive home their advantage, a hallmark of City's season so far.