Chilwell has not played since Chelsea’s Champions League final win over Manchester City on 29 May – with Marcos Alonso in his place so far this term.
The 24-year-old was in England’s Euro 2020 squad but did not play once.
“He just needs to be patient. He’s in the race now and with a good mental attitude,” said Tuchel.
“It’s been difficult for him, from a Champions League win, then it was a tough Euros because he felt he could have played a part for England, then to keep training for four or five weeks, then he had a personal break which is difficult.
“When I arrived I felt he was mentally tired which is unlucky because Marcos Alonso had a full pre-season. We had some talks with him and no further worries with him.”