With Billy Gilmour having joined Norwich City for the season and other midfielders among those late returners, Tuchel feels that is one area he needs to consider carefully, even if he believes the young Scot's move to Norfolk was the right decision.
"There is one space minimum there because Billy left us, which is good for his personal development because he was fighting with N'Golo Kante, Jorginho and Mateo Kovacic in midfield," Tuchel told the club's website.
"He was fighting in one of the best midfields in the world and he was very helpful last season but now he goes on loan for minutes because this is how to improve. It's a good decision but he was very important so we have to be careful.
"We come from a situation where Kovacic was on the pitch [against Arsenal] but N'Golo only played 30 minutes and Jorginho is coming soon so we have to be careful that we don't over-use them. We are also prepared for maybe some little injuries and that's why we are still scouting."
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