Because I believe they technically have a potential to win both titles this season. But without Salah this is just much more difficult to achieve.
Klopp wanted Salah to be back early at Liverpool but not like this.
I've discussed this in the Premier League thread. The wrong injury will make Liverpool experience a bad situation in every match. Liverpool will have difficulty competing in the Champions League and will have difficulty winning the Premier League title this season. It is said that Salah suffered a hamstring injury which is an injury that takes quite a long time to recover. I don't know if this news is true or not so cmiiw. If this is true then this will make Liverpool the favorite team to win the Champions and EPL in my personal opinion.
This is what Kloop was afraid of, but in the end it happened, that's why in an interview a few days ago he said he wanted Egypt to collapse immediately so they wouldn't qualify for the Africa Cup of Nations final, so he could quickly return to Liverpool. But now Moh Salah is injured, of course this will make Kloop dizzy. The injury suffered by Moh Salah is of course very detrimental to Liverpool at the moment because Liverpool has the ambition to win the EPL League and European League. Without Moh Salah, Liverpool will have difficulty achieving their ambitions. Indeed, currently Liverpool does not only rely on one player, but losing Moh Salah has made them lose strength on the front line and lose fear of their opponents.