England was reversed by Senegal 1-3 at home in a friendly match, and Tuchel suffered his first defeat since coaching the Three Lions.
When facing the media after the game, Tuchel said: "We just lost a warm-up match, there is no need to panic. We won all three World Cup qualifiers and scored 9 points. By September we will be very competitive, and we will definitely be. The team will work hard to achieve two wins, 100%. Now we understand ourselves better and think more flexible.
"The team is indeed facing some difficulties now. Of course, I am the most dissatisfied person. I must admit that I don't like this kind of loss. But the World Cup won't start next week, and we still have a year left. I think the process of selecting international players will naturally become more intense and the requirements for players will be higher.
"By September, October and November, we will enter the pre-World Cup season, which will also increase the intensity of competition. From then on, everything will be different."