Chelsea are now third on three points behind second-placed Valencia.
Coach Erik ten Hag says players need to be organised and not to lose possession.
Sanches, who joined Bayern as an 18-year-old in 2016 from Benfica, was largely confined to a minor substitute's role in Munich amid strong competition for a starting spot.
Pepe's £72 million transfer to Arsenal comes after a breakthrough season with Lille that saw him named in the Ligue 1 Team of the Year.
The length of Pepe's deal at the Emirates Stadium was not announced but is believed to be 5 years.
El Ghazi is Villa's second signing of the summer, following last week's addition of Birmingham City forward Jota.
Former France forward Remy smashed in a volley from a clever free-kick on 27 minutes to hand Lille a 1-0 win over Bordeaux.
'We've had a magnificent season, we must make it exceptional by producing a big performance in Lyon next Sunday."
It was PSG's heaviest league defeat since Qatar Sports Investment (QSI) took over the club in 2011.
PSG will be crowned champions on Wednesday if they win at Nantes.
PSG, who have 80 points, will clinch the title if they beat Racing Strasbourg.
Lille take their tally to 49 points from 24 games.
Pepe's 13th goal of the campaign drew him level in the Ligue 1 scoring charts with PSG's Kylian Mbappe.
Lyon are three points behind Lille with a match in hand, while Montpellier, who did not play for a second consecutive week, are another two points back but have played two games fewer than Lille.
Nicolas Anelka will work at Lille’s youth academy advising the apprentices.
PSG extend their lead at the top of Ligue 1 to 11 points after a 12th straight league win, beating Tottenham Hotspur's old record.
According to coach Thomas Tuchel, Gianluigi Buffon will start for Paris Saint-Germain in games against Lille and Napoli.
Jonathan Bamba's two goals helped Lille beat Saint-Étienne 3-1.
Nicolas Pépé earned two penalties and scored one in Lille's victory.
Jonathan Ikoné's goal helped Lille to a 2-1 victory over Nantes.
Lille's season has taken another turn for the worse as they lose to their fellow strugglers to miss the chance to move out of the bottom two.
Some of the fans who swarmed onto the pitch managed to shout insults and even aim kicks at players.