Jose Mourinho was at the Pierre-Mauroy stadium for Sunday's Ligue 1 game between Lille and Montpellier that ended in goalless draw.
"Dani teed me up well, I went with instinct and I found the top corner," Mbappe said. "We were up against a good team, especially at home."
It wasn't the spectacular display from Old Trafford but Kylian Mbappe and PSG did enough to take three points from Saint-Etienne.
Kylian Mbappe's second-half strike earned Paris Saint-Germain a 1-0 win at Saint-Etienne in Ligue 1 action on Sunday.
Monaco beat Nantes 1-0 to record their second home win of the season in Ligue 1 on Saturday to move out of the relegation zone for the first time si
Kylian Mbappe's rich vein of form isn't confined to competitive games. The PSG striker is also eclipsing benchmarks on the training ground.
Mario Balotelli scored again as Marseille beat Amiens 2-0 to move up to fourth place in Ligue 1.
The body of Emiliano Sala, who died in a plane crash last month, was laid out in a gymnasium in the town where he grew up.
Nabil Fekir earned Olympique Lyonnais a 2-1 home win against En Avant Guingamp on Friday as they cemented third place in Ligue 1.
Neymar was ruled out for 10 weeks after suffering a metatarsal fracture of his right foot in the 2-0 French Cup win over Strasbourg on Jan. 23.
Anti-racism groups are calling for French authorities to investigate racist and anti-Semitic graffiti targeting PSG striker Kylian Mbappe.
Jonathan Johnson PSG correspondent
OFFICIAL -- The PSGxJordan crossover's newest items.
Nantes paid a final tribute to former striker Emiliano Sala in a 4-2 home defeat against Nimes in Ligue 1 on Sunday, three days after the Argentine
Marco Verratti helped PSG beat Bordeaux but Edinson Cavani left injured ahead of a crucial Champions League match against Manchester United.
Edinson Cavani opened the scoring with a 42nd-minute penalty before leaving the pitch, three days before PSG take on Man United.
Manchester United were 11 points adrift of the Champions League places when Ole Gunnar Solskjaer took over in December but are now in fourth place.
Edinson Cavani came off injured in the first half of Paris Saint-Germain's Ligue 1 home game against Bordeaux on Saturday.
Mario Balotelli's second goal in three games helped Marseille to a 2-1 win at Dijon in Ligue 1 on Friday.
A body found in the wreckage of a plane in the English Channel has been identified as that of footballer Emiliano Sala.
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