Thomas Tuchel's Chelsea appointment has been inspired but it remains to be seen whether they will all stay friends

German coach likes full control and that can cause friction with club boards

Chelsea players celebrate after beating Manchester City 1-0 to win the Champions League final on Saturday, May 30.

Chelsea manager Thomas Tuchel celebrates after Kai Havertz's winning goal.

Chelsea players celebrate after beating Manchester City in Porto.

Chelsea players celebrate after the match.

Chelsea players celebrate after the match.

Dejected City players Phil Foden and Sergio Aguero after the match.

Chelsea's Kai Havertz skips past City goalkeeper Ederson to put his team ahead in the first half.

City's Phil Foden on the attack being chased by Reece James of Chelsea.

City forward Raheem Sterling sees an early chance saved by Chelsea goalkeeper Edouard Mendy.

City manager Pep Guardiola.

Chelsea striker Timo Werner shoots at goal in the first half but City goalkeeper Ederson saves his weak finish easily.

Kai Havertz celebrates his first-half goal. Getty

City players see their penalty appeals turned down in the second half.

Chelsea midfielder N'Golo Kante heads over the bar in the first half.

City midfielder Kevin de Bruyne receives treatment after being caught in the face by Antonio Rudiger's shoulder.

Kevin de Bruyne with his eye injury clearly visible.

City's Kevin de Bruyne is substituted due to his face injury.

Chelsea defender Antonio Rudiger slides in to deny Phil Foden a shot at goal.

Chelsea's Cesar Azpilicueta and Kevin de Bruyne of City challenge for a header.

Chelsea's Thiago Silva on the ground due to an injury that led to him being substituted in the first half.

Chelsea's Kai Havertz is mobbed by teammates after scoring.

Christian Pulisic misses a chance to make it 2-0 to Chelsea.

Chelsea manager Thomas Tuchel after a missed chance in the second half.

Changing a team's coach in the middle of the season is never a guarantee of anything. In Chelsea's case, it has served them wonderfully.

Since the arrival of Thomas Tuchel in January, the team has improved significantly in the Premier League as well as winning the Champions League final against Manchester City – not to forget the way they eliminated the powerful Atletico and Real Madrid.

Tuchel transformed an erratic and, at times, uncompetitive team into a tremendous block that conceded few goals and imposed their own rhythm.

In the Porto final, Tuchel went against his own principles. In the Premier League, his weapon was a 3-4-2-1 formation that flooded the centre of the pitch. For the final he adopted a 5-4-1 that broke the lines of Manchester City's attacking short-ball possession, their tiki taka football.

It was a tactical lesson but Guardiola helped. Starting without Fernandinho or Rodri seemed unwise and he paid dearly for such an attacking line-up and confused game plan.

Tuchel has now beaten Manchester City three times in six weeks, in three different competitions and with different tactics.

But who is Tuchel? The slender German coach succeeded Jurgen Klopp at Borussia Dortmund, giving rise to all kinds of comparisons, some more justified than others.

Tuchel is more methodical and cooler, and nothing diverts him from meticulous planning and detail, be it the politics of club scouting, approaches to the market, even the nutrition or sleep quality of the players.

This style of management can lead to relationship friction and explains why the 47-year-old Bavarian-born coach has not remained at clubs for lengthy spells.

It led to serious disagreements with Leonardo, PSG's sporting director, notably after the club lost several players for free. Tuchel was fired at Christmas last year, a few months after taking the Paris club to their first Champions League final.

There were similar problems at Borussia Dortmund and Mainz, where he became incompatible with the club board and sporting directors.

We now know that Tuchel met Chelsea owner Roman Abramovich for the first time on the pitch at Estadio do Dragao after the Champions League victory.

We can only hope that, contrary to the past, the relationship between manager and the board will be amicable.

So far, the decision to hire Tuchel has been inspired but it should be remembered he did not choose the current players and a new transfer window is approaching where he will want to be active and in control.

It remains to be seen whether the club understands this and he stays for a long time.

In the meantime, congratulations Chelsea and congratulations Thomas Tuchel.