The two actors are now already in negotiations for the second installment of the big-screen adaptation of Stephen King's classic horror novel It. TTHR reports that McAvoy is in talks to play the adult version of Bill Benbrough, while Hader will play the grown-up Richie Tozier.
McAvoy, 38, is being tipped to play the adult version of Bill, played by Jaeden Lieberher in the first film.
With Chastain playing an older version of Beverly, it looks like returning director Andy Muschietti's grown up Losers Club is nearly completely rounded out.
Chastain is already on board to play Beverly Marsh, the group's lone female member who as an adult ends up in an abusive marriage. Chapter Two will follow the last half of the novel, when the characters return to their hometown years later as adults to face Pennywise once again.
The sequel will also include new scenes showing the kids as they deal with the aftermath of the first story, so expect all the young actors to return alongside Bill Skarsgård as Pennywise, the creature's favorite form. Andy Muschietti, who directed the first It, told Variety in 2017 that he wanted to bring all the original actors for flashback sequences, but it remains to be seen if this will happen.
Production for the sequel will begin on July.
The highly anticipated sequel "IT" is set to start production this summer, so it's just about time for all the big casting news to start rolling out.
The original movie grossed $700 million worldwide with nearly half that amount from North America, and it was a pretty daring decision to split the movie into two parts with the first chapter being a period piece and the second chapter meant to take place in present day.