Saul struggled to impress on his debut against Aston Villa last week.
Tuchel said: “We have guys who lack the same experience as him. They all shared the experiences from their first matches.
“When I was on the sideline for my first match, it was at another level. If it comes up to you every three days it is quite impressive, maybe a shock of cultures.
“We don't doubt his quality. It takes maybe a bit of time to get it off his shoulders but he is at an age (26) where it does not worry him too much."
Ahead of Sunday's derby against Tottenham, Tuchel continued: "For me at the moment it is more important that we are competitive, we play relentless and have belief to overcome difficult minutes and periods within games. Aston Villa played at their top level, this is what we have to accept and respect. Competition is high. It is a good thing that we are able to win."