Christophe Galtier insisted Kylian Mbappe is happy at Paris Saint-Germain, though admitted Lionel Messi's future with the French giants is undecided.

Mbappe is the leading marksman in Ligue 1 this season with 12 goals – one ahead of team-mate Neymar – while Messi tops the assists chart with 10, having also found the net seven times.

The France international was heavily linked with a free transfer to Real Madrid last season, but eventually signed a new three-year deal with the reigning Ligue 1 champions in May.

Many believed financial gain played a significant factor in Mbappe's decision, while reports have also suggested the 23-year-old has recently been reconsidering whether he wants to remain at the club.

But Galtier told Marca: "I don't think it was the money, because world-class players – whether in Spain, England or France – win it. They are not for the money. I think Kylian just loves PSG. 

"If he's happy, why shouldn't Kylian be here next season? From the moment the player enjoys on the field and feels that he is in a team that can win and that can conquer great challenges, he has no reason to leave."

Asked if he felt Mbappe was happy at PSG, Galtier added: "Yes, sure. Guaranteed."

Meanwhile, Messi's existing contract is due to expire next June, although there is the option of extending his stay in the French capital for an additional year.

"There are many parameters," Galtier said when asked what it would take for the Argentina captain to remain at the club beyond this season. 

"The first thing is their desire. Do you want to continue at PSG? Are you happy here? The first thing to know is if he wants to continue. All these types of decisions are made between the player and [football advisor] Luis Campos."