The Disappearance of G. Callen — Where Has the 'NCIS: Los Angeles' Character Been?

Chris O’Donnell’s ‘NCIS: Los Angeles’ character G. Callen has been absent early on in Season 14 of the CBS show. Where has he been?

Source: https://www.distractify.com/p/where-is-callen-on-ncis-los-angeles