Chelsea are currently being linked with a move for Barcelona midfielder Frenkie de Jong.
De Jong is said to prefer a move to Chelsea over Manchester United, and his signing could require the club to spend up to £70m.
While Tuchel is open to the signing, he believes Chelsea need to prioritise new acquisitions for their defence and attack, rather than midfield.
When asked about further signings before the end of the window after Chelsea’s win over Everton, Tuchel told Sky Sports: “Yeah, if we can add, we add.
“Maybe not necessarily a midfielder as a first option but we’re open for everything.
“I think we can use new energy, new legs and fresh input to bring us to a new level.
“If not, then we will push this team but I think we could use some more input and some more quality. We’re on it but we will not tell you [who].”