Mbappe put it simply: he was "fed up" of how the mask felt.
He told reporters: "They played a better game than us. A big gap? We should review the game. We conceded two goals quickly and in the second half we had opportunities to come back but we didn't come back.
"Playing without the mask? Before the game, we made the decision, I was fed up with the mask, I asked the doc if I could and he told me I could do what I wanted."