This is no secret really as it is on the BBC website, but in short, Aston Villa have been hit strongly by covid-19, so far 9 of their players have tested positive. It seems to be on several websites in Europe elsewhere too so you have to be quick!
So the Villa side will field U23-team, if they test negative, and the manager Dean Smith is also not interested in these FA Cup games and he stays out.
There is no reason for Jurgen Klopp not to take advantage of this easy fixture.
Liverpool will naturally rotate too, but still it is likely that we something like this tonight:
Kelleher/Williams-Phillips-Williams-Milner/Jones-Thiago/Chamberlain/Shaqiri-Minamino-Origi
0-4 or so.