PSG could have been on the brink of elimination from Group H with a defeat at Old Trafford but Neymar put last season's runners-up ahead in the sixth minute and the world's most expensive player sealed their victory in stoppage time.
With 2-0 away win against a Juventus side deprived of Cristiano Ronaldo, Barcelona bounced back from their weekend defeat in the Clasico against Real Madrid and shut out the boardroom crisis which led to president Josep Maria Bartomeu resigning.