Thomas Tuchel defended Kylian Mbappe following his red card in Paris Saint-Germain's win against Nimes, though he said the teenage sensation must show restraint.
French World Cup winner Mbappe was sent off for pushing Teji Savanier as Ligue 1 champions PSG defeated promoted Nimes 4-2 on Saturday.
The 19-year-old put PSG ahead with their third goal before he was given his marching orders in the dying seconds for reacting to a rash Savanier challenge.
"It was a horrible foul. He had an emotional reaction," PSG head coach Tuchel said. "He was lucky not to be seriously injured.