The Cobham graduate has played at left-wing in our most recent Premier League games against Norwich City and Newcastle, but was asked to play right wing-back in the cup-tie with Southampton last week.
"He thought that it will be tough to get minutes and maybe easier in another club, but you can never be sure it is like this," Tuchel said, referring back to the summer.
"I told him straight that we rely on him and that he accepts his role. There is still huge progress he can make within this group and club.
"Was it always fair to let him play right wing-back? No, maybe not.
"But he had to take one for the team and he did. He was always positive and he showed the right spirit. He had a very good pre-season where we could see what he was capable of on the half left side. He struggled in the beginning to prove that point in matches and now we had some injuries, and it was needed for him to show up and deliver. This is what he did.
"To get a place in this team it is all about performance and this is what Callum shows at the moment and now it is important that he shows consistency and stays hungry and keeps on progressing.
"Enjoy the moment, but at the same time absolutely be aware of what it takes to stay in the team. It looks good at the moment."
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