"Chelsea Football Club and Antonio Conte have parted company," the London outfit said on their website.
Tuchel has agreed an 18-month contract with the option of another year, the west London club announced.
UEFA announces UCL final hosts for next four seasons.
Chelsea's youthful new-look squad reminds Juergen Klopp of his Bundesliga-winning former Borussia Dortmund team, the Liverpool manager said on Friday.
All the summer transfer details right here...
List of major transfers in the top Premier League ahead of the 2019-20 season (all transfer fees as reported by British media):
Lampard was handed a three-year contract having left second tier Derby County.
Klopp said the upcoming transfer window was likely to be more subdued than in previous years due to the impact of COVID-19 on clubs' finances.
Chelsea are banking on a lavish shopping spree to give them more bite up front and much-needed solidity in defence after coach Frank Lampard spent last season relying heavily on a crop of inexperienced home-grown players.
Real Madrid goalkeeper Keylor Navas says the signing of Belgium keeper Thibaut Courtois has not affected his desire to remain at the triple European champions as he emphatically ruled out leaving the club in order to be assured of first team football.
Former Barcelona defender Alba to sign for Inter Miami
Among other transfer news globally, defender Rahul Bheke joins Mumbai City FC while Locatelli completes Juventus move.
Check out the 10 most expensive transfers in British soccer history.
England left back Ashley Cole moved from Arsenal to Chelsea with French defender William Gallas going in the opposite direction.
A round-up of Tuesday's action in the UEFA Champions League.
On a seismic day in the history of Chelsea, Romelu Lukaku scored the winning goal in a 3-2 FA Cup fifth-round victory
News of all that transpired on and off the football field.
Chelsea have completed the signing of Basel's Egyptian winger Mohamed Salah, the Premier League club said on their website on Sunday.
The German captain joined the English champions from Bayern Munich on a free transfer.
Everton have agreed to sign Barcelona's Colombia centre back Yerry Mina for an initial 30.25 million euros ($34.97 million) and have also taken the club's midfielder Andre Gomes on loan, the Spanish champions said on Thursday.
Chelsea agreed a deal to sign Real Madrid striker Alvaro Morata, subject to the Spain international agreeing personal terms and passing a medical.
Diego Costa has accused Chelsea of treating him like a "criminal" in a forthright newspaper interview which will deepen the breach with the Premier League club.
France international striker Antoine Griezmann has reached an agreement with Manchester United over a transfer from Atletico Madrid at the end of the season, Yahoo Sport has reported.
Thierry Henry has been named head coach of the country's Under-21s until 2025
Chelsea striker Diego Costa is looking for a move away from Stamford Bridge after being told by manager Antonio Conte that the 28-year-old is not part of his plans at the Premier League club, the Spain international has said.
Chelsea named former Napoli boss Maurizio Sarri as the new head coach on a three-year term on Saturday, a day after parting ways with another Italian manager Antonio Conte.
Former Barcelona and Chelsea veteran Samuel Eto'o may be heading to Anfield.
Real Madrid's Brazilian forward Robinho is a transfer target for Chelsea, according to the player's agent, Wagner Ribeiro. The impending arrival of Luiz Felipe Scolari as the new Chelsea manager -- he takes the helm officially on Tuesday -- has increased the likelihood of the move happening.
Liverpool have extended captain Jordan Henderson's contract, the Premier League side said on Tuesday, putting an end to speculation over his future at the Merseyside club.
Bayer Leverkusen have signed South Korean forward Son Heung-min from Hamburg SV and have agreed with Chelsea for the transfer of winger Andre Schuerrle as the club prepare for next season's Champions League, they said on Thursday.
The British transfer record was smashed twice on Monday as Liverpool sold Fernando Torres to Chelsea but raided Newcastle United for an immediate replacement in the shape of burly England frontman Andy Carroll.
A Chelsea deal for Barcelona forward Lionel Messi would be impossible under financial fair play rules, assistant coach Steve Holland said on Friday.
Records tumbled in the transfer window as Premier League spending totalled 1.165 billion pounds ($1.54 billion), financial analyst Deloitte's Sports Business Group said on Thursday. The outlay represents a 34 percent rise on the previous highest in all windows of 870 million pounds set 12 months ago and means the overall spend by clubs in 2016-17 already represents a record for a single Premier League season.
Chelsea have signed Brazil midfielder Oscar, the English Premier League club said.
Chelsea have re-signed midfielder Nemanja Matic from Benfica, three years after selling him to the Portuguese side, the Premier League club said on Wednesday.
Champions Chelsea are involved in the relegation battle this season, manager Guus Hiddink said on Friday ahead of his side's Premier League clash with Everton.
With nine days remaining before the transfer window closes for the season, around 93 million pounds has been spent by English clubs on new signings.
Arsenal took the race to the final day last season and are strongly tipped to end Manchester City's dominance this time.
