Covid or something must have affected Mane, his touch and the spring in his step have completely disappeared, he doesn't run as much either anymore. Salah has been the better player this season. It affects them a lot as Manes the natural dribbler in the team but I don't think I've seen him dribble once in the 10 or so Pool matches I've watched this season. A completely change from the player he was.
Klopp hasn't helped things either for Liverpool by not playing Fabinho and Henderson (when he was fit) in midfield. They're two top class, CL winning midfielders that can control a game and defend and create, and instead he goes with a 19 year old and Thiago 0.25x speed Alcantara.