Overview
- The 27-year-old Argentina international joins on a four-and-a-half-year contract with an option for an additional year.
- Multiple outlets report a fee of about €29m (£26–27m), while the club did not disclose terms.
- West Ham said Castellanos was identified as a key target by Nuno Espírito Santo, with Sky Sports reporting recruitment is focused on the manager’s list.
- The striker was registered in time to be available for Tuesday’s Premier League match against Nottingham Forest at London Stadium.
- Castellanos is the club’s second January addition after striker Pablo Felipe, arriving with 22 goals in 98 games for Lazio following spells at New York City FC and Girona.