BBC pundit Mark Lawrenson has backed West Ham to beat Chelsea, with the two London sides set to face off at the Olympic Stadium this Sunday - and he named Marko Arnautovic as the man who can make the difference if healthy.
The Blues have won all five of their Premier League games so far this season, having brought in a new manager in former Napoli boss Maurizio Sarri. But the Hammers have started their season in stark contrast under Manuel Pellegrini, another coach appointed during the summer.
Pellegrini's men have only recorded one win so far, beating a depleted Everton side last weekend to earn their first three points of the new campaign.