PSV Eindhoven were dealt a harsh lesson in finishing on their return to Champions League football as they slumped to a 4-0 defeat in London.

Peter Bosz’s decision to name an attacking line-up backfired as his team were run ragged in the early stages and punished for failing to close down Arsenal’s fleet-footed front line.

The Gunners took an early lead when Bukayo Saka thumped in a rebound after Walter Benitez could only parry a shot by Martin Ødegaard in the eighth minute.

Twelve minutes later Belgian winger Leandro Trossard drilled a shot into the right-hand corner to double the lead. And Gabriel Jesus made it three before half-time when he took down a cross by Trossard and fired it past Benitez.

PSV improved in the second half, but were unable to stop Ødegaard rounding off a standout performance with a long-range shot into the bottom corner after 70 minutes.

PSV’s next match is a reunion between striker Luuk de Jong and his former club Sevilla in Eindhoven on October 3.

In the other match in Group B, the Spanish side drew 1-1 at home to Lens. Sevilla went ahead with a header by Lucas Ocampos inside 10 minutes, but a fine free-kick by Angelo Fulgini midway through the first half earned the French visitors a point.