The German got the better of Manchester City's manager, Pep Guardiola, for the third time this season with a masterful tactical game plan that his team executed to perfection.
"We overcome some difficult moment and some very dangerous moments with fantastic attitudes to defending," Tuchel said.
While Tuchel's other two victories over City came in the FA Cup semi-final and the Premier League, Saturday's triumph in Porto was on an entirely different level against a team that was being trumpeted as the best in club football.
City's manager, Guardiola said, "We didn't arrive but, yeah, I would like to say it was an exceptional, exceptional season for us.”
With the celebrations in full flow, Tuchel was already plotting more silverware for a young team that has emerged as the most likely challengers to City's domestic dominance.
Chelsea outplayed City on Saturday and could have won by a bigger margin than Havertz's first Champions League goal had they been a little more clinical.