Derwin James Jr. said he got the heads-up from Chargers general manager Joe Hortiz months ago.

In modern football, players evolving to play different positions or roles as they get on in their careers has become increasingly commonplace.

For the first ten years of his career or so, Theerathon Bunmathan made his name as a barnstorming left-back -- establishing himself as one of Southeast Asia's best to the point that he not only earned...