It took a huge blunder to gift Paris Saint-Germain victory in the first Champions League match of its post-galactico era.

An embarrassing late blunder gifted Paris St Germain a 1-0 home victory over Champions League debutants Girona on Wednesday as the visitors' goalkeeper Paulo Gazzaniga let a Nuno Mendes cross slip through his legs and into the net.

Having mostly convinced in league action so far – four wins in four games – Paris Saint-Germain’s first test of the European campaign against Girona came at a time when the customary early-season optimism was at its apex.