Lanzini made 29 appearances for West Ham last season, scoring five goals and creating nine assists.
The 25 year-old's ruptured anterior knee ligament injury is not just a blow for Argentina, but something that fans at the London Stadium will surely be concerned about.
Argentina, who lost in the World Cup final to Germany four years ago but only qualified for this years tournament by winning their final qualifying match, have been drawn in Group D where they play Iceland on June 16, Croatia on June 21 and Nigeria on June 26.
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West Ham have been linked with a number of midfielders in the transfer market, including Manchester City veteran Yaya Toure, and Lanzini's injury could intensify the pursuit for signings in this area. All eyes will now be on Argentina coach Jorge Sampaoli to see who will be replacing Lanzini in the squad.
The severity of the injury suggests the Argentine will miss the opening weeks of the 2018/19 Premier League campaign although it yet to be confirmed.
Argentina's national team is due to travel to Russian Federation on Saturday for the World Cup.
"Enzo Perez will be the player to replace Manuel Lanzini", the handle was quoted.