The Irishman, 45, stepped up from his role as set-piece coach to take charge in June and has guided the Bees to seventh in the Premier League. Under his leadership, Brentford have secured notable victories over Manchester United and Liverpool while eyeing European qualification for the first time in their history.
Andrews expressed his desire to 'earn my stripes' after following Frank's successful seven-year tenure, while director Phil Giles praised him as a 'really good fit' for the club after an 'outstanding' first season.