The Manchester United midfielder goes into the World Cup under huge pressure from Les Bleus fans and pundits.
But Mbappe insists: "He's important.
"He played the last World Cup, he played the Euros, he plays in a big club, he experienced his transfer to Manchester. He is a great player and the big players are always bosses in their team.
"He has this personality that makes him take a lot of people with him along his way. And we are ready to follow him."