Kylian Mbappe was forced off the field at half-time in France's Nations League opener against Denmark on Friday.

The striker, who last month signed a new deal with Paris Saint-Germain despite interest from Real Madrid, sustained a knee injury towards the end of the goalless first half.

He pulled up with nobody around him and did not return to field for the start of the second period, with Christopher Nkunku introduced in his place.

Mbappe limping down the tunnel would have been a concern for Didier Deschamps, whose side have three more Nations League games to come in the next 10 days.

However, Deschamps' assistant Guy Stephan confirmed to French outlet M6 that the substitution was purely precautionary.

Mbappe watched the second half from the substitutes' bench at Stade de France with his leg heavily strapped.