Paris Saint-Germain's French forward Kylian Mbappe (right) fights for the ball during the French L1 football match between SCO Angers and Paris Saint-Germain (PSG) at The Raymond-Kopa Stadium in Angers, western France on April 21, 2023. (PHOTO / AFP)

Kylian Mbappe has not been included in Paris St Germain's squad for their Asian pre-season tour amid reports that he has been put up for sale by the Ligue 1 side.

Relations between Mbappe and PSG have been tense since the French forward said last month he would not renew his contract which expires at the end of next season, when he could leave Paris for free.

PSG president Nasser Al-Khelaifi has said they will not let him go for free after the club spent 180 million euros ($200 million) to sign him.

According to media reports the Parisian club will put up the 24-year-old for sale as of now as they believe he has already agreed on terms to join Real Madrid for free next summer.

PSG representatives did not immediately reply when contacted by Reuters for comment on Friday.

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PSG's Kylian Mbappe gestures during the French League One soccer match between Paris Saint-Germain and Lyon at the Parc des Princes stadium in Paris, Sunday, April 2, 2023. (PHOTO / AP)

PSG have won nine of the last 11 Ligue 1 titles, but the team and Mbappe have been frustrated with their performances in the Champions League - a trophy the Parisian club have never won despite all their investment in the squad.

PSG went out in the last 16 round this year when they were beaten by Bayern Munich, failing to score in both legs. Mbappe was injured for the first leg and said they were "helpless" in the second.

Brazilian forward Neymar, another big name tipped to leave the club, has been included in coach Luis Enrique's squad set to play against Cristiano Ronaldo's Al Nassr on Tuesday in Japan.

READ MORE: Mbappe named best Ligue 1 player for 4th consecutive time

PSG will also face Japan league's Cerezo Osaka and Serie A side Inter Milan before travelling to South Korea to take on Jeonbuk Motors.