PSG host relegation battling Le Havre on Saturday
Woeful defending led to two Brighton goals in two first-half minutes as Glenn Murray and Shane Duffy outsmarted United's 117 million pound ($149.21 million) back four to demonstrate why manager Jose Mourinho had sought to upgrade it.
Eric Bailly was particularly exposed and, having conceded a needless corner that led to Duffy's first Premier League goal, he blundered in to foul Pascal Gross, who put away the penalty via David de Gea's leg on the stroke of halftime.
($1 = 0.7841 pounds)