Victories over Andorra and Serbia were achieved without established stars Jude Bellingham, Bukayo Saka, Cole Palmer and Trent Alexander-Arnold.
Tuchel said: “I am always brave. You know that. But I don’t talk now about hypothetical names that can be left out. Let’s see who’s fit and available.
“I think we took some brave decisions already. We nominated a squad of only 21 to keep the competition going. The competition is on. If you are in camp, you are in your best behaviour, your best shape, best form and you make the best of it.
“It’s a privilege to be in camp and then fight for your place. If you can help everyone to be better and to grow and this is what we did.”
On their 5-0 win in Serbia, he added: “Of course. This is a team sport. This was team work in its purest form.
"They have the quality to play for us and the hunger to play for their country and everyone gets his chance. If a big player misses out on a tournament, we need to have solutions, if he misses a camp, we need to have solutions.
“We have to focus on the guys who are available and who are ready to be the best versions of themselves and the best teammate possible and this is what we did.”