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Taty Castellanos scored two goals and provided three assists in 10 Serie A appearances this season West Ham have signed Lazio striker Valentin 'Taty' Castellanos for an undisclosed fee on a four-and-a-half-year contract, with the option for a further year. The 27-year-old joined Lazio in 2023 and made 98 appearances, scoring 22 goals and providing 16 assists. Castellanos, who has won two caps for Argentina since making his debut in 2024, has also played for New York City FC and Girona. West Ham said head coach Nuno Espirito Santo identified Castellanos as "a key target". Castellanos said he will "give everything" to the club. "Every match is a battle, and I'm here to contribute that, to try to bring that energy, that fighting spirit I have inside, so that every match is as important and as tough as possible, " he said. Castellanos is Nuno's second January signing following the arrival of Brazilian striker Pablo Felipe from Portuguese club Gil Vicente for a reported 25m euros (£22m). West Ham are 18th in the Premier League as they prepare for Tuesday's match against Nottingham Forest, who are four points above them in 17th. 'Shocking, pathetic and embarrassing' - can Nuno save West Ham? Latest West Ham news, analysis and fan views Ask about West Ham - what do you want to know? Comments can not be loaded To load Comments you need to enable Java Script in your browser Tactics, transfers and turmoil - inside the fall of Amorim Man Utd to appoint caretaker manager for rest of the season after Amorim sacking Celtic sack manager Nancy after eight games A familiar fixture in film that reflects British life Daliso Chaponda and guests start 2026 with a good laugh A minute-by-minute account of the night the unsinkable ship sank Is the desire for vengeance stronger than the longing to be loved? 'Amorim's toxic exit the latest chaotic chapter in Ratcliffe's reign' '2/10' - how England's bowling unravelled in Sydney Rice, Watkins & Cunha make cut - FPL team of the week Rosenior deserves Chelsea chance, says Rooney Four are in - but who might complete Premier League Darts line-up? Fury comes out of retirement. .. again 'I want to dominate' - Littler takes another step towards greatness Entertaining & frustrating, but will Brook 'evolve'? Leeds v Man Utd - a rivalry that really matters Women's game did not need 'Battle of Sexes' - Swiatek 'Haunted Nancy detached from reality as Celtic's lights go out' 'Good idea' or taking 'massive chance' - is Rosenior ready for Chelsea? 'We need to protect players' - how can tennis avoid breaking point? 'Paul was fun': Remembering snooker's lost great 20 years on Sporting highlights to look forward to in 2026 Best images of 2025 F1 season - on and off the track The 25 best sports photos of 2025 - and the stories behind them Copyright © 2026 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.