PSG star Neymar was rested while Mbappe served the first of a three-match ban for their 4-0 thrashing of Saint-Etienne last night, which keeps them atop the table having netted 17 goals in just five games.
Without his two star players, Tuchel gave Julian Draxler a start, a move that paid off as the German global put the hosts in front with a header in the 22nd minute after a long pass by Marco Verrati.
Speaking at a postmatch press conference, Tuchel explained Neymar's absence in simple terms.
Edinson Cavani, Angel Di Maria and teenage substitute Moussa Diaby were also on target in a comfortable victory for the champions. Today we were without Neymar and Kylian and I'm happy to have used players that were here during the worldwide break.
The Reds host French champions PSG in a mouthwatering clash at Anfield in the first group stage game of this season's Champions League.
"It's important to several options when we play".
PSG will be shorthanded for the match, which perhaps opens the door to a surprise result at the Parc des Princes.
The Saint-Etienne players were wearing shirts carrying the name of William Gomis, a former youth player at the club who was shot dead in the south of France earlier this week.
"We know that Anfield is one of the toughest trips in Europe".
The French champions were dumped out of last season's competition by Real Madrid, who went on to lift the trophy after beating Liverpool in Kiev. "Liverpool will reveal something but most importantly it will give us a better idea of our situation". "It will be a big test for us, but we are confident".