The former Ajax star has only started two games under the new coach and it has been reported that he is unhappy at Stamford Bridge.
Ziyech joined Chelsea in the summer from Ajax following his impressive performances for the Dutch side.
“It is my fault actually, not his, it is my hard decisions at the moment as well for Mason [Mount], Callum [Hudson-Odoi] and for Christian [Pulisic] sometimes in the half positions where we seem the strongest,” Tuchel said in a press conference.
“There are decisions for other players that means Hakim suffers, I can absolutely understand and agree with that so it is my responsibility and fault in this case that he cannot show more of his potential.
The 27-year-old has made 19 appearances for Chelsea in all competitions this season scoring two goals.