Lewis-Skelly has not started a Premier League game for Arsenal this season, but he has impressed in cup competitions.
Despite this, he was selected for the England squad to face Wales and Latvia next week.
Tuchel emphasized that Lewis-Skelly's place on the team for the World Cup next year is not guaranteed, and he will need to play more regularly for his club to stay on the team.
Tuchel praised Lewis-Skelly's behavior and performance in the last camp, saying he was a good teammate and a valuable addition to the team.
However, Tuchel stressed that Lewis-Skelly's performances at club level will be a key factor in determining whether he stays on the team.
Tuchel also noted that the proximity of the camps and Lewis-Skelly's recent performance in the last camp will benefit him, but his club performances will be crucial in the next month.