The defender, on loan from Schalke, as the champions fell to a fifth consecutive home defeat - a 1-0 reverse to Chelsea - but reported an issue afterwards which now makes him a doubt for the weekend.
"Ozan had, after the game, a little problem," Jurgen Klopp told reporters. "We will see if he is ready for Fulham but it doesn't look like it at the moment.
Klopp has already lost centre-backs Virgil Van Dijk, Joe Gomez and Joel Matip for the season, whiled Fabinho only returned after injury on Thursday.
In a rare boost, Liverpool may be able to call upon defender back Nat Phillips after he missed the Chelsea game, while there is also a chance deadline-day signing Ben Davies, who has yet to make an appearance, could be back in the squad.
Klopp added: "Nat I think will be ready, Ben as well. It's not easy for Ben, we brought him in and he has to adapt. He is a really good player. We have to be careful."
Diogo Jota transferred himself into his Fantasy Premier League team, so could he be set for a start?
Liverpool predicted lineup (4-3-3): Alisson; Alexander-Arnold, Fabinho, Phillips, Robertson; Thiago, Wijnaldum, Jones; Salah, Firmino, Mane
Injury list: Henderson, Van Dijk, Gomez, Matip
Doubts: Kabak, Kelleher, Phillips