Kalidou Koulibaly moved to Chelsea from Napoli in a transfer worth £33 million this summer.
And he made his debut for the club in their 1-0 victory over Everton at Goodison Park.
He looked commanding at the back as he lasted 75 minutes before suffering from cramp.
The Chelsea fans who travelled to Merseyside were in full voice as they chanted the name of their new centre-back.
But rival fans aren't convinced the chant makes sense.
Chelsea supporters sang: "Aaaaay Koulibaly.. ooh aah... I wanna knoow he's from Senegal..."
Koulibaly's rather underwhelming song got fans online talking.
One tweeted: "Makes absolutely zero sense hahahahaha."
A second wrote: "They've literally just chucked a couple of words together and put it into a chant."
A third added: "They kept this going for a good ten minutes solid too. Absolute 0/10 song."
Another commented: "Should be a points deduction."
Former Chelsea player Pat Nevin was impressed with the Senegal international's first showing in the Premier League.
He told BBC Radio 5 Live, per The Chelsea Chronicle: “Chelsea fans were worried about losing Antonio Rudiger. They’ve got Rudiger mark II, haven’t they?
"Different players but Kalidou Koulibaly’s tackling has been excellent."
Chelsea's new No.26 will likely keep his place in the starting XI when the Blues resume their campaign on Sunday against Tottenham.
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