In his first season in east London, Lanzini was voted the 2016-17 Players Player of the Year, and earned a call-up to the senior Argentina side. After suffering torn ligaments before the World Cup, Lanzini will spend his third season on the sidelines.
The Hammers enter the season with new manager Manuel Pellegrini, a Premier League winner with Manchester City.
The away jersey is dark teal with claret accents. An Umbro double diamond pattern is on the cuffs. "IRONS" is printed on the upper back.