Saliba ain't been injured homes, he was banned by the Liverpool supporting VAR in an entirely fair decision-making process. Not that I'm salty about that of course. Trossard and Rice were also both banned for a game for getting a second yellow for something that is objectively a yellow-card offence, but also one that no other player has been given a second yellow for this season even though dozens have been on camera as well as in front of referees doing it while on a booking. But that's splitting hairs.
Actual other injuries include:
Timber
Zinchenko
Partey
Tomiyasu
Calafiori
Tierney (but not sure we really count him anymore)
Our fit first-team-squad defenders for tonight apparently include Saliba, Kiwior and er.... that's about it. Our fault for relying on eternal crocks like Zinchenko, Tomiyasu, Partey and Tierney.