Neymar was substituted early in the second half of the draw at Bordeaux on Sunday with an apparent groin problem.
The 26-year-old suffered a groin injury on international duty with Brazil last month, which meant he missed the league win at Toulouse.
However, he was able to return for PSG in their crunch Champions League clash at home to Liverpool this week.
Tuchel hopes the problem is not serious and that Neymar will be available again when Montpellier visit the Parc des Princes on December 8.
“I do not know at all (what he has), I think (that’s the same injury as before Liverpool),” Tuchel told L’Equipe after the 2-2 draw at Bordeaux.
“We must be careful. He said that it was not a problem to play tonight but the ground was hard. We made the decision with everyone, Neymar, the physio, that he did not take any risk to play.
“He felt good but by the time he felt something he came out on time. We will leave him alone against Strasbourg and he will be ready, I hope, against Montpellier.”
PSG dropped points in Ligue 1 for the first time this season as Bordeaux twice came from behind to earn a 2-2 draw at the Matmut Atlantique.
Neymar had given PSG the half-time lead, but Bordeaux were level early in the second half through Jimmy Briand’s strike.
The champions looked like maintaining their perfect start to the campaign and making it 15 league wins in a row when Kylian Mbappe restored their advantage after 66 minutes.
However, substitute Andreas Cornelius headed another equalising goal for the hosts with six minutes remaining.
Tuchel told the club’s official website: “We lost a little intensity in the second half. Bordeaux took their chance by scoring the equaliser, even if we should have scored a second goal at the end of the first half.
“We had the chance to extend our lead when we were 2-1 up, we had a lot of chances and could have had two penalties.”
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