Ward caught the eye of director Larry Charles, and he was cast as a series regular, the son of Ana Ortiz, in the 20th Century Fox sitcom pilot Outnumbered with Cheech Marin.
[2] In 2011, Ward was asked to guest star on the sports comedy series Sports Show with Norm Macdonald on Comedy Central, for which he was nominated for a Young Artist Award and won an OMNI Youth Music and Actor Award, Outstanding Actor, in the 12- to 18-year-old category.
In April 2012, Mateus landed a recurring guest star role as Marcus Davenport on the teen sitcom Lab Rats on Disney XD.
Then he was offered the role of young Franky in his first feature film Lonely Boy, where he portrays a teenager with schizophrenia.
In the eleventh episode, titled "Shabbot Shalom", Ward played the role of Austin, a young teen who discovers a dead body.