The opening whistle at the Parc des Princes had barely been blown before PSG netted their first Champions League goal of the night against Arsenal.

Arsenal already ready to break my heart.. it better not lose please

— Dark Paradise.. (@oneh_slaiy) September 13, 2016

PSG had Edinson Cavani to thank for their early lead, who headed home after just 42 seconds of play.

For 42 seconds then, I thought we would easily win the Champions League 😂😂😂 embarrassing! #arsenal

— Tony Jerome (@Arsenalfanblog) September 13, 2016

Just 42seconds into the game… 😭😭😭 Arsenal is a Joke club.

— BORN TO RUL£ (@phemoi) September 13, 2016

Arsenal's start in the Champions League be like

— Danny Watkins (@dannywatty) September 13, 2016

I'm gonna have a heart attack by 22 being an Arsenal fan

— Twist (@tmlieberman) September 13, 2016

Gunners boss Arsenal Wenger made the risky gamble of swapping the favoured goalkeeper Petr Cech for David Ospina – and probably regretted it soon after.

Arsene Wenger brings all the criticism on himself, how the hell is Cech not playing in their hardest Champions League group game? #UCL #ARS

— Alex (@AlexPearce95) September 13, 2016

When will Wenger learn that resting Cech never pays off.

— Brandon (@itsbeanybaby) September 13, 2016

I really don't understand the policy of Wenger when it comes to keepers. Would definitely choose Cech over Ospina in a game like this.

— TJ Mateo (@timjammat) September 13, 2016

There’d also been high hopes that German central defender Shkodran Mustafi – who was snapped up at the end of the transfer window – would transform Arsenal’s back line, but fans still found the Gunners’ defence questionable.

So pleased we strengthened the defence in the transfer window. Making such a difference NOT #arsenal

— Dave Lloyd (@montipora14) September 13, 2016

PSG cutting through Arsenal's defence like a knife through butter… #UCL

— Shannon (@shannon_ae) September 13, 2016

That was so basic so poor so embarrassing so typically Arsenal

— AFC GLEN (@AFC_GLEN) September 13, 2016