He was however unable to emulate the European success he experienced at Sevilla with PSG, with a crippling defeat against Barcelona in the Champions League last season leaving his position perilous.
Tuchel says "it is with much joy, pride and ambition that I am joining this big club, Paris Saint-Germain".
As of just a few minutes ago, Thomas Tuchel is officially the new manager/head coach of Paris Saint-Germain.
Tuchel has been out of work since May of previous year when he was axed by Borussia Dortmund.
Despite spending a world record 222 million euros (195.7 million pounds) to attract Neymar during the close season, the Ligue 1 side were eliminated in the last-16 of the Champions League by Real Madrid.
"I can't wait to work with all these great players, who are all among the very best on the planet", declared the man of the hour upon putting pen to paper on Monday. With my coaching staff, we will do everything we can to help the team reach success, including on the global scene.
"There is extraordinary potential in Paris and this is the most exciting challenge that I have received".
Praised for his attractive style of attacking play, Tuchel was without a club since he was sacked by Borussia at the end of the 2016-17 season.
PSG president Nasser Al-Khelaifi said: "Thomas is one of the most competitive European coaches to have emerged at the highest level in recent years".
However the 44-year-old German manager has signed a two-year deal in Paris, with the expectation of delivering the Champions League firmly on his shoulders. "He has the mix of spectacular and effective principles that have always been the true strength of German football".