The Hawkeye actor took to Instagram to post a video.
"So, this is not a good-bye, only a see-ya-later. It's a wrap for me on Infinity Wars. Couldn't be more excited to see how they put this together. Very excited. Also excited to go home and see my baby," Renner said.
The Avengers 4 has a May 3, 2019 release.
An unprecedented cinematic journey ten years in the making and spanning the entire Marvel Cinematic Universe, Marvel Studios’ “Avengers: Infinity War” brings to the screen the ultimate, deadliest showdown of all time. The Avengers and their Super Hero allies must be willing to sacrifice all in an attempt to defeat the powerful Thanos before his blitz of devastation and ruin puts an end to the universe.
Anthony and Joe Russo direct the film, which is produced by Kevin Feige. Louis D’Esposito, Victoria Alonso, Michael Grillo and Stan Lee are the executive producers. Christopher Markus & Stephen McFeely wrote the screenplay. “Avengers: Infinity War” releases in U.S. theaters on May 4, 2018.