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The 31-year-old striker signed a new contract in mid-September, delighting Arsenal fans. But he's struggled after agreeing the deal, netting only one Premier League goal since (a penalty against Manchester United).
However it's his attitude as well as his form that is concerning Gunners fans, including Morgan.
"There's something about the body language, particularly of Aubameyang right now," he told Sky Sports News.
"Whether that's a lack of confidence because he hasn't scored for a few games... there's something going on behind the scenes I think at Arsenal.
"Whether it's linked to Mesut Ozil and his situation, with £350,000 per week going to a guy sitting there on his PlayStation, I don't know, but it seems to be seeping into this team.
"A little bit of discontent, a lack of fight, a lack of passion, a lack of coherent tactics, and all these things, we had them a few weeks ago, so they've gone somewhere."
"There is something going on behind-the-scenes..."@GMB host @piersmorgan is worried about the body language of the Arsenal squad - in particular Pierre-Emerick Aubameyang - ahead of the North London Derby- Sky Sports Premier League (@SkySportsPL) December 4, 2020
While Piers admits he is a "huge fan" of Aubameyang - unsurprising given his previously prolific form for the club - some Arsenal fans on social media are being less forgiving.
"Aubameyang's body language stinks," summed up one supporter after the 2-1 defeat to Wolves on Sunday.
"Aubameyang was the worst player on the pitch today. His body language was very languid. He isn't captain material," was an even more damning assessment.
Aubameyang is tired of playing for Arsenal. His body language says it all.- Emmanuel (@Emmyebimoh) November 29, 2020
Aubameyang was the worst player on the pitch today. His body language was very languid. He isn't captain material.- Lio (@cannon_crested) November 29, 2020
Aubameyang's body language stinks @AFTVMedia- TheNotoriousBigAmrik (@NotoriousAmrik) November 29, 2020
Arterta needs to try this his Europa League team in the EPL it's time to drop Aubameyang, sorry to say but he has dropped in form and his body language in matches isn't even encouraging as a captain.- :blue_heart::heart:Ultimate Kombo :flag_ng: (@ultimate_kombo) December 3, 2020
Aubameyang's body language says a lot, he is not ready to play for Arsenal- Hon_ArsenalInMyBlood (@HonTimmy007) November 29, 2020
Aubameyang's body language is worrying. The captain seems to have accepted his fate- Michael Shoko (@MichaelXhoko) November 29, 2020
Body language before kickoff is all wrong, Captain Aubameyang looks bored or scared, the rest look like they would sooner been somewhere else, no drive, no heart, no passion, no spirit, no enthusiasm and no points pic.twitter.com/c5EdEptWwH- Gary_GoOner_AFC (@Gary_Gooner_AFC) November 30, 2020
Arsenal's No 14 is certainly lacking sharpness for arguably the first time in his career at the club. He was barely a threat in the box against Wolves, which is something you can rarely say about the Gabon international.
However Aubameyang was full of praise for Mikel Arteta after his double against Chelsea won the FA Cup for Arsenal in August. So it would be bizarre if he's somehow lost faith in his manager so soon into the 2020/21 season.
Morgan certainly believes that Arteta - and Aubameyang - deserve the benefit of the doubt for now.
"I think you've always got to give a new manager, I believe, probably three or four windows," Morgan told Sky Sports. "They've got to get the team that they want to be judged on."
:heart_eyes::heart_eyes::heart_eyes::heart_eyes::heart: my bro you know :punch: https://t.co/1OUH4azeMP- AUBA:zap: (@Aubameyang7) November 12, 2020
However Arsenal face Tottenham on Sunday, eight points behind their north London rivals who sit top of the table, while Arsenal are in 14th spot.
Another out-of-sorts display from Aubameyang and his teammates and the scrutiny will only increase on both the manager and his captain.
Image credit: PA Images/Sky Sports
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