Mauro Icardi was brought on to replace the World Cup winner, with Mbappe then heading to the bench and walking past Tuchel.
It wasn't clear if the pair had words, but Tuchel then ensured that he grabbed hold of Mbappe to forcefully make his point over why he had decided to substitute him. Mbappe apearred to disagree with his manager, and after several seconds of confrontation he headed to the bench, where he cut a moody figure.
Afterwards, Tuchel remarked: "I'm the coach, someone has to decide who goes off and who comes on – it's me.
"He is very intelligent, he knows what he is doing. He doesn't like going off, nobody likes going off.
"These are not good images, but we are not the only club that has to deal with this sort of thing.
"It's not good, because it opens up subjects that go against the team's state of mind. Too bad.
"I am not angry, but I am sad because it is not necessary. I explained to him why we did this, and it will stay that way. I will always decide the technical aspects. We don't play tennis, we play soccer and we have to respect everyone.
"I don't know, I have to think, I have to sleep.
"I will make a decision. We have training at 11am, we will talk about the match with the group. I'll see if I talk about this or if I do it individually. It will depend on my night's sleep too!"
Tuchel substituted Mbappe and he was absolutely fuming...— Transfer News (@TrustyTransfers) February 1, 2020
Kid acting like he’s got 5 Ballon d’Or’s to his name.