Lampard was dramatically sacked on Monday after a dismal run of form has left them ninth in the Premier League table and 11 points off leaders Manchester United.
Tuchel, who had been out of work for one month after being axed by Paris Saint-Germain, will be tasked with getting an immediate response out of squad that has failed to show any cohesion in the weeks leading to Lampard’s sacking.
Former PSG boss Thomas Tuchel, 47, has been appointed as Chelsea’s new manager
The German tactician arrives to replace Frank Lampard, who was dramatically axed on Monday
A recent 2-0 defeat to Leicester saw the process of finalising a deal for Tuchel accelerated
The 47-year-old’s credentials were enhanced significantly last summer when he guided PSG to the Champions League final, where they were narrowly beaten by Bayern Munich.
Lampard departed with the worst points-per-game ratio of any manager in the Roman Abramovich era, a statistic that did not go unnoticed.
Sportsmail understands that Abramovich, despite preferring to wait until the summer to make a change when more of his preferred replacements would have been more readily available, accelerated his initial interest in Tuchel immediately after the loss to Leicester after conceding a new boss had to appointed immediately to save the club’s season.
Indeed, it is understood Tuchel could have been in place prior to the win over Luton on Sunday but Covid travel restrictions meant Lampard was afforded one more game, which he won to reach the fifth round of the FA Cup.
But despite the win, the decision to eventually replace Lampard with Tuchel was made.
The fact Tuchel was available immediately proved a key factor in his appointment.
Tuchel becomes the 13th permanent manager of Abramovich’s tenure after Claudio Ranieri, Jose Mourinho, Avram Grant, Felipe Scolari, Guus Hiddink, Carlo Ancelotti, Andre Villas-Boas, Roberto Di Matteo, Rafa Benitez, Antonio Conte, Maurizio Sarri and Lampard.
He will be able to avoid quarantine measures so he can take training and matches thanks to a special exemption in Covid rules governing elite sport.
Tuchel, who is travelling to the UK from Germany, and not in an elite sporting bubble would normally be expected to face at least five days in self isolation.
Sportsmail understands that the FA can apply for special exemptions for elite sports people and ancillary staff, including managers and head coaches, even if they are not part of an elite sport bubble.
Unlike Lampard, Tuchel made little to no impression as a player. But as a manager the German has caught the eye and established himself among Europe’s elite.
Tuchel first gained attention in the 2010-11 campaign when he led Mainz, usually a mid-ranking club in Germany, to the Europa League.
Owner Roman Abramovich is now onto his 13th manager since purchasing Chelsea in 2003
Tuchel’s stock in Europe is high having impressed with both Borussia Dortmund and PSG
FIRST FIVE GAMES
JANUARY 27: Wolves (H)
JANUARY 31: Burnley (H)
FEBRUARY 4: Tottenham (A)
FEBRUARY 6: Sheffield United (A)
FEBRUARY 10: Barnsley (A) – FA Cup
He went on to bigger jobs at Borussia Dortmund — where he succeeded Jurgen Klopp in 2015 and won the German Cup — and then at PSG, where Tuchel claimed four major trophies and reached the Champions League final last season.
Tuchel will be familiar with many players in the Chelsea dressing room with Thiago Silva a key man for Tuchel’s PSG.
The Brazilian centre back should be an early ally at Chelsea along with Christian Pulisic, who played for Tuchel at Dortmund.
One of Tuchel’s key objectives will be to revive the form of both Timo Werner and Kai Havertz.
Werner, who arrived from RB Leipzig, and Havertz, who signed from Bayer Leverkusen, joined for a combined £125m and yet have failed to kickstart their careers in the Premier League.
It is hoped that Tuchel, as a German speaker, can coax the form out of the pair that saw Chelsea spend so heavily to get them.
Tuchel has experience of managing the best players in the game with a successful spell at PSG working with Neymar and Kylian Mbappe.
Tuchel succeeded Jurgen Klopp at Borussia Dortmund in 2015 and won the German Cup
The German-speaking coach will be expected to gel with Chelsea’s former Bundesliga stars
Former Manchester United centre back Rio Ferdinand was full of praise for Tuchel prior to his appointment as Chelsea manager having been left impressed by him following a meeting in Paris.
‘He was one of the most impressive managers I’ve met,’ Ferdinand told BT Sport.
‘Very insightful, a man of detail. Speaking to the players who he managed (at PSG) – Dani Alves, Gianluigi Buffon – they couldn’t speak any more glowingly about him.
‘The ambience at the club was at an all-time high.
‘He’s German and I think that’s an interesting point as Kai Havertz and Timo Werner haven’t caught fire yet.’
Tuchel’s remit will be to get Chelsea’s top four bid back on track while also looking to guide this current crop of players to a trophy with the FA Cup and Champions League two competitions the Blues are competing in.
They travel to Championship Barnsley in the fifth round of the FA Cup on February 10 before the first leg of their Champions League last-16 tie with Atletico Madrid 13 days later.
More to follow.
Much of Chelsea’s dismay stemmed from Lampard’s struggles to get the best out of their costly summer signings – most notably Timo Werner (left) and Kai Havertz (right)