Speaking on Thursday, Wagner played down suggestions that Liverpool might be without a string of top names after the likes of Mohamed Salah (groin), Virgil van Dijk (rib) and Naby Keita (muscle) suffered injuries on worldwide duty.
It has been reported that Mane suffered a broken left thumb while on global duty with Senegal, with the forward injuring his hand in their Africa Cup of Nations qualifier against Sudan.
Jurgen Klopp will hope to have the attacker available after a costly global break that also saw Mohamed Salah and Naby Keita pick up suspected thigh problems. Juergen Klopp's side entertain Red Star Belgrade in the Champions League next week.
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"But training looks tremendous". Nobody, not even he, knows how long he can [play] and stuff like that.
In a triple boost for boss Jurgen Klopp, Milner was also snapped in training today after overcoming a hamstring injury that he sustained against Manchester City before the global break.
The spate of injuries threatened to leave Liverpool shorthanded for their clash against the Terriers, but the Reds can be buoyed by some good news in training. Koeman also said he believed Van Dijk would be "ready to play" against Huddersfield. "But he is 100 per cent back and looks really good in training".
Salah suffered a muscle problem during Egypt's defeat of Swaziland while Van Dijk picked up a rib injury in the Netherlands' victory over Germany.