Last season, Osgood was leading the team in special teams tackles with 19 until he suffered a torn pectoral muscle on Dec. 4. Despite missing the final four games, Osgood finished the season ranked second on the team behind Hanik Milligan's 21 tackles. Incidentally, Milligan was voted to the AFC Pro Bowl squad as the conference's top special teams performer.
"Kassim is an outstanding special teams performer and a rising quality receiver," said General Manager A.J. Smith in a statement. "He has championship work ethic and character. He's the kind of player you need to win championships. We're thrilled to have him with us the next four years."