The Gunners are currently in Singapore as boss Unai Emery gets his side into shape ahead of the new Premier League season.
Arsenal’s tour squad includes a number of summer signings including new shot-stopper Leno.
And keeping with tradition, new boy Leno was forced to sing an initiation song in front of his team-mates after dinner on Friday.
Standing up on a chair with a microphone in hand, Leno belted out a song in German much to the delight of his team-mates.
Pierre-Emerick Aubameyang was on hand to document Leno’s embarrassing rendition and posted it to his Instagram story.
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Alexandre Lacazette tried his best not to laugh at the shot-stopper while other players failed.
A number of Gunners men were heard hysterically laughing including Aubameyang.
A clip of Leno’s performance was also posted to Arsenal’s Twitter account and fans were quick to rinse the 26-year-old for his shocking singing.
“Never ever give up playing football!!” one fan wrote on Twitter.
Another fan said: “Omg this is awful.”
“Lucky we brought him in as goalkeeper not as entertainer,” a third supporter said.
“Good lord,” wrote a fan clearly unimpressed by Leno’s song.