The character is set to receive a job offer from Callen (Chris O'Donnell) and Hanna (LL Cool J).
Executive producer Kyle Harimoto said: "We asked our casting directors Susan Bluestein and Jason Kennedy to find us a talented young actor, who was extremely funny, highly athletic, charismatic and had an incredible work ethic.
"After they finished laughing at us, they started an exhaustive national casting search. We saw Caleb's work, flew him out to meet with us and knew immediately that he was going to be the person to give life to FBI Agent Devin Rountree."
Last month it was reported that NCIS and its spin-offs NCIS: Los Angeles and NCIS: New Orleans, as well as Blue Bloods, are going to be making some big changes following the death of George Floyd at the hands of police a few months ago.
CBS Television has collaborated with law enforcement and public safety advisory group 21CP Solutions in order to alter the way police are depicted on its crime shows.
Speaking about the partnership, NCIS: Los Angeles showrunner R Scott Gemmil said: "Having an audience of millions of viewers each week comes with a great deal of responsibility.
"This new partnership will help us ensure that our storytelling continues to produce accurate portrayals of law enforcement, and will hopefully allow us to play a small part in the ongoing reform moving forward."
NCIS: Los Angeles airs on Sundays at 9/8c on CBS in the US and on Sky One in the UK.
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