Mbappe burst onto the scene for Monaco midway through last season and has quickly become the most sought after striker in Europe.
Real Madrid are one of a number of teams who are interested in signing the 18-year-old, along with Arsenal and French giants Paris Saint-Germain, in what would be a world record fee of over £100million.
Lebouef believes Mbappe has the attributes to become one of the best players in the world and even reach the heights of Real goal machine Ronaldo.
"He has everything," Leboeuf said on ESPN FC.