The actor previously worked with Cameron on Titanic, the second highest grossing film of all time, only behind the original Avatar.
With the Avatar sequels costing upwards of $1 billion — making them the most expensive movies ever made — director James Cameron can afford almost any actor.
Previously talking about the project, Cameron said: “The thing is, my focus isn’t on Avatar 2.
Winslet fans can catch the actress in cinemas this weekend alongside Idris Elba in The Mountain Between Us.