Lumbala appeared in all 18 regular-season games last season for the Lions. Continuing his role as an effective pass and run blocker, he also totalled a career-high of 125 yards on 14 receptions while contributing eight special teams tackles.
Lumbala was originally selected by the Lions in the second round, ninth overall, at the 2008 CFL draft.
He has appeared in 117 career regular-season games and nine playoff contests, and helped B.C. win the Grey Cup title in 2011.
Lumbala was the Lions' nominee as Most Outstanding Canadian last season.