The highly rated 19-year-old is yet to start a Premier League game for Arsenal so far this season but has impressed in their cup games.
Despite Lewis-Skelly’s lack of minutes, he still earned a call up to Tuchel’s England squad to face Wales and Latvia next week.
Tuchel has warned the youngster that his place for next year’s World Cup isn’t guaranteed, however, and will need to start playing more regularly.
"To just be a good citizen in camp will not be enough over the course of a year," Tuchel said.
"He was a very good player in camp, a very good team-mate in camp (last month). But being a good team-mate in camp may not be good enough to stay the whole year with us.
“You have to perform at club level on a regular basis. In the last camp he got the credit, that I was convinced we have to take care of him and nominate him because we accelerated his career.
“It was our responsibility after we called him last season. So, we stick to this. He was now part of a very successful camp, so he gets the reward for that. But if you remember he was not part of the 20-man squad in the match in Serbia.
"Still, his behaviour was outstanding, even if he was not part of the squad. His training, his attitude, his attitude to push and support the guys on the pitch was outstanding and of the highest level.
“He is one of the players who benefits from this decision, from sticking with the same squad, but the performances (for Arsenal) will be a key factor in the next month.
“He benefits also from the proximity of the camps and that (the last one) was three weeks ago."