The Premier League called off its full weekend fixture programme following the death of Queen Elizabeth II, saying it took the decision "as a mark of respect" for a monarch who had been "an inspiration".
After discussions with Government officials, an announcement of the postponements came in a statement from the league at 11:30 BST.
It read: "At a meeting this morning, Premier League clubs paid tribute to Her Majesty Queen Elizabeth II.
"To honour her extraordinary life and contribution to the nation, and as a mark of respect, this weekend's Premier League match round will be postponed, including Monday evening’s game."
The weekend programme had been due to kick off with Fulham's home game against Chelsea at 12:30 BST on Saturday, ending with Leeds United's Elland Road clash with Nottingham Forest on Monday evening.
Premier League chief executive Richard Masters said: "We and our clubs would like to pay tribute to Her Majesty's long and unwavering service to our country.
"As our longest-serving monarch, she has been an inspiration and leaves behind an incredible legacy following a life of dedication.
"This is a tremendously sad time for not just the nation but also for the millions of people around the world who admired her, and we join together with all those in mourning her passing."
The EFL, which runs the Championship, League One and League Two in England, also announced the postponement of its fixtures, with a blanket cancellation of all football then confirmed.
The Football Association (FA) said all games across England would be postponed from September 9 to 11.
It said the Queen had "left a lasting and indelible legacy on our national game".
She had been a patron of the FA and famously handed over the Jules Rimet Trophy to England captain Bobby Moore after the 4-2 win over West Germany in the 1966 World Cup final.
The FA said: "As a mark of respect, following the passing of Her Majesty the Queen, English football has united to postpone all football fixtures between 9-11 September."
It said this applied all the way down to grassroots level.
The FA's statement added: "Our thoughts remain with our president, HRH The Duke of Cambridge, and the whole of the Royal Family during this time."
Al-Khaleej 0-1 Al-Nassr: Ronaldo misfires on return as Laporte nets winner
Cristiano Ronaldo returned from suspension but failed to find the net as Al-Nassr secured a 1-0 win over Al-Khaleej on Saturday, with Aymeric Laporte coming up with the decisive goal.
Ronaldo was in action for the first time since being sent off for an elbow in a 2-1 Saudi Super Cup loss to Al-Hilal earlier this month, with his initial two-match ban being reduced to one on appeal.
He missed three good chances as Al-Nassr threatened to fall further behind runaway Saudi Pro League leaders Al-Hilal, but former Manchester City defender Laporte spared his blushes by nodding Marcelo Brozovic's deep free-kick into the bottom-left corner with 68 minutes gone.
Al-Nassr remain nine points adrift of Al-Hilal at the summit in spite of their win, with Jorge Jesus' team unbeaten through 28 games this season as they close in on a record-extending 18th title.
Data Debrief: Ronaldo misfires on return
Ronaldo was presented with the Saudi Pro League's Player of the Month award for March ahead of kick-off, having scored four goals in three league appearances last month.
However, his sights were off on Saturday as he failed to net despite three of the visitors' four big chances, as defined by Opta, falling his way. He led all players on the pitch for expected goals (1.27 xG), shots (five), shots on target (three) and touches in the area (nine) without reward.
Huddersfield all but relegated from Championship while League Two play-off spots decided
Huddersfield Town saw their relegation from the Championship all but confirmed after a 1-1 draw with fellow strugglers Birmingham City on Saturday.
The Terriers avoided a defeat that would have seen them relegated on Saturday, but even a win on the final day over promotion hopefuls Ipswich Town will not be enough unless they overcome a huge goal difference of 15 goals with Plymouth Argyle.
Birmingham remain in the other relegation place and now must beat Norwich City to stand a chance of staying up with Sheffield Wednesday, Plymouth and Blackburn Rovers also still in danger.
At the other end of the table, the Canaries dropped points in a 2-2 draw with Swansea City, leaving the door open for Hull City, who face Ipswich Town later today.
Leicester City seal automatic Premier League return
Leicester City are once more a Premier League team, having bounced straight back after relegation last season.
The Foxes secured automatic promotion without kicking a ball, as title rivals Leeds United lost 4-0 away to Queens Park Rangers on Friday.
Marti Cifuentes' Hoops side gave their fans a reason to cheer in their final home game of the season, and the emphatic win means they are now seven points clear of the relegation zone.
The Hoops boss told BBC Sport: "I came here, perhaps I was crazy thinking we could manage the great escape.
"The atmosphere has been unbelievable since I came here. Everybody thought tonight could be a special night to achieve our target.
"Big players deliver big performances and our players all did that tonight."
Defeat ensured only Ipswich Town can now finish above Leicester, meaning the Foxes will be back in the big time.
Ipswich, who have three games left to play, face play-off hopefuls Hull City on Saturday.
Speaking to BBC Sport, Leeds boss Daniel Farke said: "It's not in our hands any more [automatic promotion], we need to be honest.
"The race is not over. If Ipswich win the next two games then I will say congratulations, but if they don’t win them then we will have a lot to play for.
"As long as we have a chance, I’m far away from giving up."
Leicester could be crowned champions if they beat Preston North End on Monday and if Hull beat Ipswich.
The Foxes are looking to break the 100-point barrier, despite a wobble from Enzo Maresca's side in recent months.
After they had been so far ahead and top for all but two of the 176 days between 23 September and 17 March, an untimely dip in form handed Leeds and Ipswich hope.
However, while Leicester celebrate their promotion, they face the daunting prospect of starting next season with a points deduction, after they were charged by the Premier League with alleged breaches of the competition's Profit and Sustainability Rules (PSR).
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