Liverpool slumped to an embarrassing 4-1 Champions League defeat at Anfield by PSV Eindhoven to pile more pressure on Arne Slot, while Arsenal ended Bayern Munich's unbeaten start to the season with a "statement" win on Wednesday.

Holders PSG saw off Tottenham in an eight-goal thriller at the Parc des Princes and Kylian Mbappe scored four times in a Champions League match for the first time as Real Madrid beat Olympiacos 4-3.

Beleaguered English champions Liverpool suffered a ninth defeat in 12 games in all competitions as they crumbled against PSV.

Liverpool conceded in just the sixth minute when Virgil van Dijk inexplicably handled the ball while appealing for a foul from a corner, with Ivan Perisic dispatching the resulting penalty into the corner.

Slot's struggling side hit back quickly as Dominik Szoboszlai slotted in after visiting goalkeeper Matej Kovar could only parry Cody Gakpo's shot.

PSV came out firing after the interval and restored their lead when Mauro Junior's brilliant pass was steered in expertly by Guus Til.

The hosts' latest humiliation, after a 3-0 home loss to Nottingham Forest at the weekend, was confirmed as Couhaib Driouech twice took advantage of calamitous defending to score late on. (AFP)