Neil Harris has left his role as Millwall manager after more than four years in the position, with the Lions 18th in the Championship, five points above the relegation zone.
Harris, a club legend having scored 138 goals in all competitions during his time as a player at the Den, led Millwall back into the Championship and to two FA Cup quarter finals.
Millwall chairman John Berylson said as quoted by the club's website: “Firstly I would like to place on record my sincere gratitude to Neil for all of his hard work, commitment, determination and inarguable success as manager of this great football club.