The 47-year-old actor voices koala Buster Moon in the new musical cartoon film, which also features Scarlett Johansson, Taron Egerton, Reese Witherspoon and Seth MacFarlane.
McConaughey said he was desperate to be involved with a family film because he realised he hadn't starred in anything for years that was suitable for his children to watch, reported Contactmusic.
McConaughey has three children, sons Levi, eight, and Livingstone, four, and seven-year-old daughter Vida with his wife Camila Alves, and he made the decision to seek out an animation while watching a film with them but he had to wait four years for a part to be offered to him.
"Nobody was hiring me for about four years and then I got a call. It's a lot of fun, it's easier than live action.