Pellegrini vows to work on defence after City defeat
West Ham's day had started well with the announcement of record signing Sebastien Haller but, in terms of the game, Pellegrini felt his side faded after a bright start. A Mark Noble penalty gave the Hammers a 25th-minute lead but City overhauled that deficit with two goals in 11 minutes courtesy of David Silva and a Lukas Nmecha spot-kick. A Raheem Sterling double completed City's victory after the break although West Ham hit the post late on through Andriy Yarmolenko. 'In the first half I was happy with the performance of our team,' he said. 'We played quite well and had chances near their box. But we conceded two goals in two minutes and against Manchester City you cannot concede those goals. 'In the second half, they improved a lot as we made many changes. I think we made important mistakes in our defending but they played better in the second half. 'I was happy offensively. It is not easy to create chances against Manchester City but we must concentrate more in defence.'