Why Singo was not sent off against PSG after slashing Donnarumma’s face

The action risks getting people talking, especially given the bloody facial injury suffered by Gianluigi Donnarumma which forced him to leave the field. We are playing the 17th minute between AS Monaco and PSG when Wilfried Singo advances alone against the Italian goalkeeper. The Monegasque defender tries to steal the ball but misses support. This forces him to jump and, in his momentum, he cannot avoid the collision between his crampons and the right cheek of the Parisian, severely affected, forced to come out and be replaced by the Russian Matveï Safonov.