Transfer - Senegal - West Ham have signed striker Diafra Sakho from French side FC Metz
The 24-year-old Senegal international has moved to Upton Park after agreeing a four-year contract. His 43 goals over the last two seasons helped Metz win back-to-back promotions into France's Ligue 1.
Ba's finish came just as Chelsea looked to be on the way out after Schurrle and Oscar were both denied by the woodwork - although the London side were helped by a crucial miss from the normally reliable Edinson Cavani minutes before the decisive goal.