Kylian Mbappe is set to start as Paris St Germain face Leipzig for a place in the Champions League final on Tuesday.
The World Cup-winning France striker came off the bench to set up the stoppage-time winner as PSG dramatically came from behind to beat Atalanta in their quarter-final in Lisbon last Wednesday.
The 21-year-old had been limited to the final 30 minutes after struggling with an ankle injury but now looks set for longer involvement.
“We will decide after training whether he can play 90 minutes.”
Mbappe’s return at the Estadio da Luz would restore his partnership with Neymar, who was also instrumental in PSG’s late recovery against Atalanta by teeing up their last-minute equaliser.
Tuchel said: “Neymar has always been a leader, even when I arrived. He is showing confidence, courage, and that’s how a leader needs to act on the pitch.”
“We are here because we deserve it,” Tuchel said. “We played a great season and worked so hard, took every match seriously.
“We won’t talk about the past – only the present. We’re hungry for success, to succeed.”
Tuchel will come up against fellow German Julian Nagelsmann, who was one of his players when he coached the Augsburg reserve team early in his career. Nagelsmann, 33, is now regarded as one of the brightest young coaches in the game but it was an injury, and an idea from Tuchel, that launched his career 13 years ago.
Nagelsmann later took up the story.
He said: “I got paid as a player but I was injured and there was a choice I had to make in order to fund my studies, so I got the chance to scout and analyse the opponents.
“I never imagined back then I’d make it to a Champions League semi and play against him.”
Nagelsmann said: “The players really have the will to win, we are hungry and I can see that in their faces.
“We were great against Atleti and now we have a chance against Paris. We want to take the next step and are ready for that.”