Mbappé achieved the feat over the weekend in a 14-0 rout of Gibraltar at the age of 24 years and 333 days. Both Messi and Cristiano Ronaldo, the game's two biggest stars in the 21st century, were older when they reached the milestone. 

Henry commented, “What this kid is doing is really out of this world.” 

The former France international is now in charge of leading the new generation of France's players as coach of the Under-21 team. 

Mbappé was often compared to Henry earlier in his career. Both attended France's Clairefontaine academy before playing as left wingers at Monaco, where each won the French league titles as a teenager. Mbappé then replicated another of Henry's accomplishments when he won the 2018 World Cup in his first major tournament with France. Henry won the 1998 tournament.

Mbappé has also been compared with Brazil great Pelé for his precocity. But in terms of style, with his devastating speed and skills, he is closer to Henry.

"It's just unbelievable. He scores goals, delivers assists. He knows how to do everything. He is at the age of improvement. So, after a couple of years he should be unstoppable," Henry opined.

With his 17th career hat-trick, Mbappé brought his season tally to 21 goals in 19 matches. It was the PSG star's 46th goal in 74 international appearances. He is now just five goals behind Henry on France's all-time scoring list and 10 off teammate Olivier Giroud's national record total.

The exact number of goals in Pelé's career will forever be a topic for debate. He often said one of the reasons he should be considered the greatest player of all time was because of his feat of scoring more than 1,000 goals. But many dispute his count because Pele’s goals included in the friendly matches also.

When asked how many goals Mbappé could reach, Henry jokingly hinted at the 1,000 mark, and said “it's up for him to decide.”

"He's a guy who breathes soccer, who prepares himself well, who doesn't do everything and anything, his professionalism and desire to play are always there," Henry said.

Commenting on Kilyan’s 300-goal achievement Henry asserted, “300 goals? Several footballers haven't even managed that in training!”