Fourteenth-placed Mainz have lost three Bundesliga games in a row, but Tuchel insists the situation is not as bad as is being made out.
"There is a tendency in the public eye towards giving the impression that we are bottom of the table and without a chance," complained Tuchel at the pre-match press conference.
"That is not the case. And I am not prepared to share this view.
"I don't want to give an overall judgement about how the team is. Of course we are not oozing self-confidence after the negative results, but it is equally clear that we can win at Nurnberg.
"We continue to have faith in the ability of this team. We can win any Bundesliga game, and that includes the next one."
Tuchel is only likely to be without Adam Szalai and Fabian Schonheim, who are both injured.
Nurnberg coach Dieter Hecking is without regular goalkeeper Raphael Schafer and attacker Christian Eigler, but is still confident the players he does send out onto the field tomorrow will be able to win back the three points he believes they squandered against Borussia Monchengladbach last weekend.
"That was our first really poor game of the season," he said. "But the team has recognised what the reason for it was and has taken it upon themselves to put it right.
"We really want to win this home game."
A win for the Bavarians could take them into the top five in the table while Mainz will be looking for a win to ensure they maintain their three-point cushion over the bottom three.