Newly-Promoted Leyton Orient announced that manager Justin Edinburgh has sadly died aged 49 after suffering a cardiac arrest.
Edinburgh was behind the club's promotion back into the football league, but was rushed into hospital on Monday.
The club confirmed on Saturday night that the manager had passed away and said they were 'heartbroken' in a statement.
Orient chairman Nigel Travis said, "We are completely heartbroken by this tragedy. All our thoughts and love are with the Edinburgh family and we know from the messages that have flooded into the Club over the last week that the wider football world will share our sentiments.
"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."
Former club Spurs also tweeted their shock and condolences to the deceased's family after the news:
The Orient manager was in his eighth managerial position, having started as a player-manager at Billericay Town in 2003, but was best known for his career as a defender.
He started at Southend United in 1988 and earned himself a move to Spurs in 1990 for £150,000. His career at White Hart Lane lasted 10 years in which he played over 200 times for the north London club.
He won the FA Cup and League Cup, although he was sent off in the final of the latter, before moving to Portsmouth.
He ended his player career at Billericay, having initially moved to the non league club only as a player, before partially moving into management.
Just weeks ago Edinburgh was celebrating winning the National League. Image: PA Images
Edinburgh leaves behind him wife Kerri and children Charlie and Cydnie and our thoughts go out to them and the rest of his family and friends.