The Englishman lasted 31 games, winning only 12, before the owners pulled the trigger.
Chelsea lost for the sixth time in six games in all competitions since interim coach Frank Lampard replaced Graham Potter last month, a dismal run for a club who were crowned European champions as recently as two years ago.
West Ham suffer Fabianski injury blow
Chelsea's interim manager Frank Lampard provided an update on the injured players, stating Reece James and Mason Mount will miss the rest of the season.
Images from Tuesday's action in the Premier League
Tracking the key moves this week in the European transfer market
Postecoglou moves a step closer to making good on his reputation for securing silverware in his second season at clubs and delivering a first cup for Spurs since they won the League Cup in 2008.
The 22-year-old has signed on an eight-and-a-half-year contract in deal worth 100 million euros ($108 million).
Potter joins Chelsea a day after they sacked Tuchel, with the team sixth in the league on 10 points after six matches.
Chelsea reached the Champions League quarter-finals as a first-half goal from Raheem Sterling and a controversial penalty by Kai Havertz overturned a first-leg deficit.
Images from the English Premier League matches played on Sunday
Liverpool climbed to the top of the Premier League table with a 2-1 victory over struggling Wolverhampton Wanderers on Saturday.
Holders Real Madrid breezed past Chelsea into the semi-finals of the Champions League with Rodrygo's double securing a 2-0 win at Stamford Bridge.
Premier League champions Manchester City were drawn on Thursday with Juventus, Wydad AC and Al Ain in Group G for next year's FIFA Club World Cup in the United States.
Man Utd sign Mount from Chelsea on five-year deal
Tottenham Hotspur bolstered their hopes for a top-four finish and extended Chelsea's miserable run
Images from Sunday's action in the Premier League.
Chelsea manager Graham Potter and his family have received anonymous death threats following the English Premier League club's poor run of results.
Tottenham were booed off at the final whistle as defeat left them in fifth place
Football fans in Kerala were in for a pleasant surprise when former Chelsea and PSG coach Thomas Tuchel was spotted at the Cochin international airport on Wednesday.
Two young football fans sporting the Chelsea jersey greeted the German at the airport early on Wednesday morning.
Borussia Dortmund snatched a 1-0 victory over Chelsea in the Champions League round of 16 first leg on Wednesday
A summary of Saturday's action in the Premier League.
Images from the English Premier League matches played on Saturday.
A tap-in by Karim Benzema and a powerful strike by substitute Marco Asensio earned European champions Real Madrid a 2-0 win over 10-man Chelsea.
City's Khadija Shaw was named Women's Player of the Year, with Grace Clinton picking up the Young Player of the Year after excelling on loan at Tottenham Hotspur from Manchester United.
IMAGES from the English Premier League matches played on Sunday
Chelsea's Joao Felix endured a nightmare debut when he was sent off in a 2-1 Premier League defeat at local rivals Fulham.
Holders Real Madrid will play 2021 winners Chelsea in the Champions League quarter-finals while Manchester City's Pep Guardiola will visit his former club Bayern Munich.
Images from the English Premier League matches played on Saturday.
United are six-times League Cup winners, most recently lifting the trophy in 2022-23 with Ten Hag at the helm.
The BBC reported that the incident took place when South Korea international Son went to take a corner in the second half of the August 14 game, which ended in a 2-2 draw.
Guardiola said the expanded Club World Cup would make it even more difficult for clubs to manage player workload.
Second-half substitute Riyad Mahrez earned Manchester City a 1-0 win at Chelsea on Thursday to move to within five points of leaders Arsenal in the Premier League.
Manchester City celebrated their Premier League title on Sunday, beating Chelsea 1-0 with an early goal by Julian Alvarez in the team's home finale at a sun-drenched Etihad Stadium.
Chelsea confirmed on its website that they had parted company with the German coach
IMAGES from the Premier League matches played on Saturday.
League Two (fourth tier) side Stevenage pulled off the shock of the weekend by winning 2-1 at Premier League Aston Villa.
Images from Saturday's action in the Premier League.
Harry Kane headed in a last-gasp equaliser to earn Tottenham Hotspur a barely-deserved 2-2 draw in a feisty Premier League derby at Chelsea that ended with both managers being shown red cards after the final whistle on Sunday.
Ruben Amorim is set to become the next manager of Manchester United with the Premier League club prepared to pay Sporting the 10 million euros ($10.79 million) release clause, the Portuguese club said on Tuesday.
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