Azpilicueta, speaking with Mundo Deportivo, is adamant Tuchel's appointment has helped the team get their season back on track.
He said, "Six weeks ago we weren't at our best. Now with Tuchel everything has improved. The team has better feelings. Although the Premier has nothing to do with it, reaching the Champions League on a roll is good news.
"The solidity has recovered, fewer opportunities are granted and that speaks of the work of the group, from the first attacker to the last defender. With the new coach we try to control the games with and without the ball.
"He takes great care in improving the footballer's movement and how to attack to punish the opponent. Now we are in that first phase of quickly absorbing all the information because there is hardly any rest, processing it and carrying it out. Winning helps to continue in the same direction."