Kylian Mbappe, PSG, Ligue 1 2020-21Getty

Mbappe an injury doubt for Champions League as PSG star sits out training with thigh problem

Kylian Mbappe is an injury doubt for match-day three in the Champions League after sitting out Paris Saint-Germain's latest training session with a thigh complaint.

Mbappe scored his seventh goal of the new Ligue 1 season in a 3-0 victory away at Nantes on Saturday, converting a 65th-minute penalty to help PSG extend their run of successive domestic wins to seven.

He was seen holding his thigh when leaving the pitch to be replaced by Bandiougou Fadiga 11 minutes later, but Thomas Tuchel played down the issue in his post-match interview.

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"With Mbappe I think it's not an injury, but fatigue," the German head coach told reporters.

However, Mbappe did not take part in training with the rest of the squad on Monday morning, with PSG supporters now sweating on the fitness of a prized asset ahead of a midweek encounter with RB Leipzig.

The 21-year-old stayed indoors for further medical treatment with the club doctors and physiotherapists, and will face a late fitness test before Tuchel's side make the trip to Germany for Wednesday' game.

The World Cup winner's absence would be a big blow for PSG heading into a must-win European contest, with Neymar and Mauro Icardi both still sidelined through injury.

The French champions are second in Group B on goal difference ahead of Leipzig after two fixtures, having bounced back from a home defeat to Manchester United by beating Istanbul Basaksehir 2-0 in Turkey last week.

One man who will be available to Tuchel again is Leandro Paredes, who returned to training at the start of the week after two weeks on the sidelines with a thigh problem of his own.

After their latest Champions League encounter, PSG will turn their attention to a home fixture against Rennes on Saturday, before the international break comes into effect.

PSG will then be back in Ligue 1 action on November 20 when they face Monaco at Stade Louis II, as they continue to chase down a fourth consecutive domestic crown.