Jordan Henderson was the man Jurgen Klopp called upon to replace Keita.
Fabinho had to watch on from the bench, he has made only one start since his arrival from Monaco.
Liverpool fans have yet to see the best from Keita since he joined from RB Leipzig.
Now they’re fearing the worst and that the midfielder could face a spell on the sidelines ahead of Sunday’s clash with Manchester City.
Naby Keita: The severity of the injury is not yet known (Image: GETTY)
Naby Keita: The Guinea international went down off the ball (Image: BT SPORT)
Naby Keita: The star was unopposed when he went to ground (Image: BT SPORT)
Invalid email
We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. Read our Privacy Policy
One fan fumed on Twitter: “Napoli’s pitch is an absolute joke. Disgraceful for a top European side. Not by any means saying that it’s the reason that Keïta has injured himself, but there is for sure a chance that it at least played a part.”
Another added: “FFS. Keita's big chance. 15 minutes in and he's off. He looks gutted and a stretcher is being used. S***. Hope it's not too bad.”
“Should have rested him for City,” one fan claimed.
The severity of the injury is not yet known but it is expected that Keita was undergo tests while the match continues.