Kylian Mbappé Tells P.S.G. He Will Leave Club Next Summer

First it lost Lionel Messi. Now Paris St.-Germain, the Qatar-backed French soccer champion, could be facing the loss of another of the game’s biggest stars, Kylian Mbappe.

Mbappé, one of the most marketable athletes in sports and the cornerstone of the club’s plans to rebuild its identity around a core of top French talent, has informed P.S.G. in a letter that he will not renew his contract when it expires next June, according to an executive familiar with the discussions between Mbappé and P.S.G. The executive was not authorized to speak publicly about the talks, given their sensitive nature.

Mbappe’s decision could force P.S.G. to consider a move it would prefer to avoid: the sale of Mbappé’s playing rights as soon as this summer, rather than risk losing him for nothing when his deal run out next year. If it does entertain offers for Mbappé, P.S.G. could expect to fetch a price well in excess of $200 million that might eclipse the world record for a player.

P.S.G.’s top officials were taken by surprise by Mbappe’s letter, according to the executive, and learned of it after first being contacted by a French news outlet claiming to have received a copy before it was sent to the club. A spokeswoman for Mbappe did not respond to a request for comment. Representatives of P.S.G. also did not comment on the letter or how the club was informed of Mbappé’s intentions, which were first reported by the French sports newspaper L’Equipe.

His desire to leave comes just a few days after Real Madrid’s president Florentino Perez had responded positively to a question from a fan about whether it wou