While no confirmation for the fourth movie has been made, it seems like the producers and star Sylvester Stallone are keen to make another Expendables movie and it could include one of the biggest casts yet.
A few names that could appear in the film are two of the world's biggest stars currently working today: Tom Cruise and Hugh Jackman.
Cruise is a bonafide action star and would be one of the biggest legends within the group of guys that are already in the cast of The Expendables. He is a busy person and may not want to join in the movie if it gets in the way of his future projects, but he has also shown that he is great in a cameo.
Cruise could appear in a smaller role, similar to Harrison Ford in The Expendables 3, and show up long enough to kick some butt alongside Stallone and Arnold Schwarzenegger to make action fans go nuts.
Jackman would probably be in a similar situation as Cruise, but with even less time to appear in anything more than a cameo. The actor is currently filming Pan with roles in X-Men: Apocalypse and possibly another Wolverine movie coming up in the next few years.
Keanu Reeves is a name that has begun to pop up in many rumors after the actor has had sort of a renaissance as a leading man with his latest film, John Wick, doing so well at the box office. With Reeves entering the field again as a massive action star, he would be the most logical choice to join the group.