Whilst waiting for a corner to come into the box, Mbappe says something to Sergino Dest before Alba and Gerard Pique come into the fray.
Movistar +'s cameras picked up the conversation in full, which saw Mbappe look to get under Alba's skin by threatening him in Spanish.
"I'll kill you in the street, I'll kill you in the street," Mbappe said to Alba.
At that moment, Pique came to the defence of his teammate.
"Who are you going to kill?" the centre-back replied.
The Barcelona left-back finished off the scuffle with a comment to Pique.
"He's learning, the guy's learning," Alba said.
The full conversation between Mbappe, Jordi Alba and Pique
Mbappe to Dest: "Don't touch me."
Alba to Mbappe: "He has apologised to you. Look at your ID card. You're arrogant, you're arrogant."
Mbappe to Alba: "In the street I'll kill you, in the street I'll kill you."
Pique to Mbappe: "Who are you going to kill?"
Alba to Pique: "He's learning, the guy's learning."