Leyton Orient manager Justin Edinburgh died on Saturday aged 49, after suffering a cardiac arrest a few days ago.
Edinburgh, the former Tottenham Hotspur defender, joined League Two side Orient as coach in 2017 and led the club back into the Football League as National League champions in April.
"We are completely heartbroken by this tragedy," Orient chairman Nigel Travis told the club's website. "The success that Justin brought to Leyton Orient was incredible, but more importantly the impact he had on us all as a winner and a wonderful, inspirational human being will be his legacy and will stay with us forever.