• Manager wants defenders to watch the ball not the man• Sarri sets two-month target for players to adaptMaurizio Sarri expects further defensive problems to flare up at Chelsea as he retrains his players to “defend by looking at the ball, not the man” but is confident he has a squad capable of adopting his approach.The chaotic victory over Arsenal exposed Chelsea as a work in progress at the back, not least during a frantic and error‑strewn first half when the hosts surrendered a two-goal lead. There may be further teething trouble at Newcastle on Sunday. Related: Sergio Agüero embraces defending to erase Pep Guardiola’s doubts | Jonathan Wi...