Kamil Glik's absence in the heart of the visiting defence was acutely felt as Lo Celso started the move that resulted in the opening goal on 14 minutes, sauntering into the box to tap in a Dani Alves cross.
Edinson Cavani doubled the hosts' lead three minutes later with a towering header following a cross from Yuri Berchiche. Doubts have been cast over Lo Celso's ability to marshal the midfield from deep this season, but he was assured here and completed his brace with a near-post header inside the half hour (27').
Monaco did managed to pull a goal back six minutes before the break when Rony Lopes turned home Almamy Touré's cross. Adrien Rabiot - the darling of the PSG faithful as an academy graduate in a sea of expensive stars - was met with rapturous applause when he came off for Lassana Diarra (65'), but the change in personnel affected little change on the match. Lo Celso then left the field to a standing ovation of his own (80'), Christopher Nkunku replacing him, before Julian Draxler rounded off the scoring at 7-1 (86'). Maybe he will get the opportunity to play some games before the end of season.
Leonardo Jardim's Monaco won the hearts of neutrals last term with their swashbuckling style and faith in talented youngsters, but the sale of key players - including Kylian Mbappe to the Parc des Princes, initially on loan - coupled with PSG's all-out approach in the transfer market had the writing on the wall early in the campaign.
In quotes reported on the club's Twitter feed, Emery said: "Neymar is close to a return after the latest tests".