Having played only 13 minutes for Liverpool, Arthur will have a considerable wait for more with a muscle injury to keep him sidelined for three to four months.
“In a normal situation, he just injured a muscle. We have to wait for further assessment to wait for how long it will be,” Klopp said.
It’s a blow for the Brazilian, who made impressions during the September international break for his work to get up to speed having last made a competitive start for Juventus in May.
Arthur has played only 13 minutes, at Napoli, since his loan move and has been an unused substitute on three occasions, but will now not be available until 2023.
The injury sees Arthur’s name added to a list of midfield casualties so far this season, with five other players in the position having missed games due to one issue or another.