The 71-year-old "Wall Street" actor will reprise his role as Hank Pym, the original Ant-Man, mentor to Scott Lang and father to Hope Van Dyne, the future Wasp, reported Entertainment Weekly.
"I just got a call - they want to negotiate for a sequel and I thought, 'That's great!'. Hopefully, I won't have to carry quite as much expositional dialogue as the first one, but I had a wonderful time doing it," Douglas said.
"I welcome it. I chuckle about being involved with a movie that already has a release date in 2018. You know, it's hard to conceive of that, but it's all good," he added.