Tuchel insists he still needs time to assess the team he's inherited.
Referring to FA Cup semifinal opponents Manchester City, Tuchel said: "You close the gap step-by step. Recruiting, I don't know [if this is needed] because we show right now good performances in a very constant level in very important matches. At crucial moments we showed up, and I will tell you maybe after the season where I think we are and where we need to improve, and what the situation can be.
"Because the crucial moments come now and we are not that long together. We live these crucial moments now together. This is very nice because you get to know your team the very best if they are tight games and the pressure is on. We play a semi-final today and we play a semi-final in the Champions League and we play every game like a cup game in the league to finish in the top four.
"Then we will have a clear picture and from next year on we will start like everybody expects from us and like I expect from myself, we will start trying to win the very first match and we go from there to every match to win it. Then we will see how consistent we are and how good we are. This is a young team and I believe we will be stronger with every game and with every experience that we have, and a big experience is coming up today."