The Hammers had a mixed season last term, finishing 13th and so avoiding relegation comfortably but not playing the style of football wanted by the fans.
Now, Sam Allardyce has been told to produce a more exciting brand of play and with Andy Carroll fit for a whole season, West Ham should be better equipped this year.
Enner Valencia - £12m from Pachuca
Valencia, 25, scored all three of Ecuador's goals in the 2014 World Cup, attracting attention from throughout Europe as a result. But it is West Ham who have won the race for his signature, subject to a successful work permit hearing. He scored in Ecuador's World Cup warm-up draw with England and Allardyce will be hoping his addition will ease the Hammers' reliance on Carroll.
Cheikhou Kouyate - £7m from Anderlecht
The versatile 24-year-old who can play at both centre-back or as a holding midfielder, had been previously linked with the likes of Arsenal, Manchester City and Everton and the Hammers confirmed they had to fight "several other clubs" for his signature. Despite the inflated £7 million fee for a player unproven in the major European leagues, it appears that this could well be a shrewd piece of business from West Ham.
Mauro Zarate - Undisclosed from Velez Sarsfield
The former Lazio and Inter Milan forward, who scored four goals in 14 matches on loan to Birmingham City in the Premier League in 2008, returns to England with the Hammers. The 27-year-old Argentine is coming off a prolific season with Velez Sarsfield in which he scored 20 goals in all competitions.
Aaron Cresswell - Undisclosed from Ipswich
The highly-rated left-back was named in the 2014 Championship Team-of-the-Year and has be rewarded for his efforts with a move to the top flight. West Ham had one of the best defences in the Premier League last term and Cresswell should be a good addition to their tight back-line.
Diego Poyet - Undisclosed from Charlton
The 19-year-old midfielder, son of Sunderland manager Gus Poyet, was named the Addicks' Player-of-the-Year last season but departed at the end of his contract and has now penned an initial four-year deal at Upton Park.
Carl Jenkinson - Loan from Arsenal
With Arsenal bringing in Mathieu Debuchy, Jenkinson was considered surplus to requirements, allowing West Ham sign the 22-year-old on loan.
Diafra Sakho - Undisclosed from Metz
Sam Allardyce improved his striking options with the arrival of Sakho for a fee thought to be in the region of £3.5m. The 24-year-old Senegalese striker signed a four-year deal.
Joe Cole - Free to Aston Villa
Matt Taylor - Free to Burnley
Jack Collison, George McCartney, Callum Driver, Jordan Spence, Alou Diarra - Released
Sean Maguire - Loan to Sligo Rovers
George Moncur - Loan to Colchester United
Blair Turgott - Loan to Dagenham and Redbridge
Stephen Henderson - Free to Charlton
Raphael Spiegel - Loan to Crawley
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