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6th Jan, 2017 | 9:45pm

£15m signing needs to be made: Three things we learned about West Ham from defeat to Man City

By Amir Mir

Football Insider analyses the three talking points as West Ham are thrashed 5-0 by Manchester City in the third-round of the FA Cup at the London Stadium.

Jermain Defoe should be signed

Former Premier League player Chris Sutton stated that the Hammers should bid up to £15 million for Sunderland striker Jermain Defoe. That signing needs to happen if the east London club wants to add a bit of spark in what is turning out to be a poor season. Five goals conceded on home soil for the second time this season is alarming. Slaven Bilic’s side needs someone who can bring goals into this team and Defoe would do just that. Additionally, he would help the players such as Michail Antonio, Dimitri Payet, Manuel Lanzini and Andy Carroll in attack because of his ability to run past defenders.

Defence is a major problem

The Hammers backline has conceded 35 goals in 20 Premier League games this season, including five against Arsenal in December and four against Watford in September. Now, they shipped three in one-half against Manchester City and five overall – a major problem for manager Slaven Bilic, if he didn’t already know.  The system didn’t seem to work against Pep Guardiola’s side as they tore the London team to shreds with their brilliant one touch football and possession play. The January transfer window is open and Bilic needs to invest in new defensive players or give youngster Reece Oxford a shot.

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London Stadium helping away teams 

It becomes an issue when your home stadium helps the away side more than it helps you. That seems to be the case for West Ham and the London Stadium. They have struggled in front of their own supporters since their move from the Boleyn Ground in the summer. For the away team if feels more like a cup final, rather than an away tie, where they can play their silky football due to the gap between supporters and the pitch. This proves as a disadvantage to the Irons because they are not able to create the raucous and intimidating atmosphere they used to create at their old ground.

In other West Ham news, the Hammers have been installed as favourites to sign this striker after reported talks this week.