The former Inter Milan striker is set to start in the quarterfinal.
“With the injury to Kylian [Mbappe] and the absence of Edi Cavani, it's very important he [Icardi] plays well, that he shows his personality," Tuchel said at a press conference.
“For me he's a boy who's never afraid, who always scores, who you can trust tactically, defensively. It's a moment for him to show he's capable of putting us in the semi-finals."
On Neymar, Tuchel added: "He likes the big matches and he likes the decisive matches. He's a player you can trust in the big games. I'm absolutely convinced he will put on a big performance and that he holds the keys for us, he has the mentality for situations like this."