A fourth Expendables film has been in the works for a while. In fact, development of a fourth instalment was announced shortly before the release of The Expendables 3 back in 2014. However, a number of issues ranging from creative differences to the departure of actor Terry Crews have made the future of The Expendables 4 questionable. Still, late last year, writer and star Sylvester Stallone announced that he had started to "cook up the next adventure."
It is currently uncertain who will direct the film. The director's seat has been offered to Duncan Jones (known for films such as Source Code), as well as D.J Caruso (known for films such as Disturbia and Eagle Eye). The aim is to begin filming some time in early 2020.
Although the Expendable films have had consistently mixed receptions, each instalment has been a box office success. The Expendables 3, for example, still earned $214 million worldwide on a budget of roughly $100 million, despite the fact that it was the most poorly received of the three films.