Paris Saint-Germain coach Luis Enrique declined to criticise referee Francois Letexier for not sending off AS Monaco defender Wilfried Singo on Wednesday after a dangerous challenge left PSG keeper Gianluigi Donnarumma with a gashed face. PSG came back from 2-1 down to win 4-2 at Monaco but had to replace Donnarumma midway through the first half after Singo’s studs-up challenge …