Tuchel is looking ahead to the return fixture with Dortmund when it comes to the fitness of Thiago Silva.
The defender has missed PSG's last two fixtures with a hamstring injury that was initially expected to force him out of the second leg against the Bundesliga side.
Yet he has returned to training ahead of schedule, giving Tuchel hope he could actually have his captain available in the Champions League.
"I am more optimistic," Tuchel said.
"He has no more pain. It's the timing for him. It was possible that he might play 45 minutes [against Strasbourg].
"[But] it's too big a risk for Saturday with just one training session. We will have more intensity Saturday and Sunday for him here.
"I'm waiting for Monday; we will decide after.
"I speak with Thiago almost every day. He's completely preparing for Wednesday's game. He absolutely wants to play.
"We will decide Tuesday or Wednesday. This is the plan. We cannot push, be impatient."