France's forward Kylian Mbappe reacts during the UEFA Euro 2024 qualification football match between France and Netherlands at the Stade de France in Saint-Denis, north of Paris, on March 24, 2023. (PHOTO / AFP)

Kylian Mbappe has told Paris St Germain he will not take up the option of a one-year extension in his contract when it expires next June, L'Equipe reported on Monday.

Mbappe, a World Cup winner with France in 2018, confirmed his decision in a letter to the club and could even be sold this summer as PSG will seek to avoid losing him for free, according to the local reports.

The forward would be free to negotiate and sign a pre-contract agreement with a new club from January should he decide to see out the remaining year of his deal at PSG.

The French club, owned by Qatar Sports Investments, have already lost Lionel Messi on a free transfer after the Argentina forward left at the end of his two-year contract to join Major League Soccer's Inter Miami.

PSG have not responded to a request for comment.

PSG's Kylian Mbappe celebrates scoring his side's opening goal during the French Ligue 1 football match between Paris Saint Germain and Lens at Parc des Princes stadium in Paris, France, April 15, 2023. (PHOTO / AP)

Mbappe was widely tipped to join Real Madrid last season but rejected a move to Spain to sign a contract extension with PSG.

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The 24-year-old has long been admired by Real, who had a bid reported to be as high as 200 million euros ($215.50 million) turned down in 2021.

Real, who have already agreed a deal to sign England midfielder Jude Bellingham from Borussia Dortmund, could step up their interest in Mbappe following striker Karim Benzema's move to Al-Ittihad in Saudi Arabia.

Mbappe, one of the game's finest talents who burst onto the scene as a teenager, has won five Ligue 1 titles with PSG but the Champions League trophy has remained out of reach.

PSG's Kylian Mbappe kicks the ball during the French League One soccer match between Marseille and Paris Saint-Germain at the Velodrome stadium in Marseille, southern France, on Feb 26, 2023. (PHOTO / AP)

PSG signed Mbappe from AS Monaco in 2017 in a deal reported to be around 180 million euros, making him the world's second-most expensive signing after Neymar, who joined them from Barcelona for 222 million euros.

Mbappe became PSG's all-time top scorer after netting 41 goals in 43 games in all competitions and helped the capital club win a record 11th French title.

READ MORE: Mbappe looking to reach new heights with ambitious France

He was named France captain after leading them to a second straight World Cup final in December, where he netted a hat-trick against Argentina before losing on penalties.