Brazil superstar Neymar and World Cup victor Kylian Mbappe watched from the stands as PSG provided ideal preparation for the Champions League opener at Anfield, but the result somewhat flattered the hosts after a shaky first 45 minutes.
Paris Saint-Germain manager Thomas Tuchel has revealed that he had already agreed to a deal at the Parc des Princes before being contacted about the vacant managerial position at Bayern Munich last season.
The Saint-Etienne game was Verratti's first appearance of the season and he completed 68 minutes following his latest adductor setback.
Goals from Edison Cavani, Angel Di Maria, an own goal scored by Timothée Kolodziejczak and Diaby was enough for the Parisians to remain on top of the league table. Tuchel told the club's official website: "I'm very happy with this victory, our sixth in a row since the start of the season".
"It was a good rehearsal, good for the confidence ahead of Tuesday's match in Anfield against Liverpool".
Without his two star players, Tuchel gave Julian Draxler a start, a move that paid off as the German worldwide put the hosts in front with a header in the 22nd minute after a long pass by Marco Verrati.
Without Kylian Mbappe and Neymar, PSG were still too hard to restrain for Saint-Etienne.
"Not yet the 11th and I do not know my game system". He found the net in the 22nd minute, controlling Marco Verratti's lofted pass with his head before deftly nodding the ball over onrushing goalkeeper Stephane Ruffier.
Tuchel rejected the idea PSG's Ligue 1 games are of any less significance than their Champions League ones.
Thomas Tuchel is set to rest Neymar this weekend when the Ligue 1 champions face St. Etienne in a bid to have the Brazilian at his very best after a taxing worldwide break.
"We knew PSG were stronger than us but four goals are expensive".
Other two Champions League contenders will feature in Saturday's action on road, with Lyon visiting Caen and Monaco facing Toulouse.