Salah stayed for this season luckily. However Liverpool wouldn't get this lucky next time. There have already been Saudi clubs going after him. You know how much one of them got close last summer. 
If Liverpool still hopes Salah to stay and offer a good contract extension, I think Salah will continue to stay in Liverpool. Even if Saudi teams try to sign salah and offer him with huge salary, I think Salah still wants to focus on playing in the top league in the world (EPL). It will be good for his career if he stays to play in the most competitive league.Not only Salah though. They might lose Diaz too as he was also speculated in the same transfer window. I mean there isn't such thing as they can't find anyone to replace them. But these players are literally the main goal sources. Liverpool will need to work hard surely. But for now, they don't need to worry. Arne Slot has started impressive.
I still don't see a rumor that Diaz will leave Liverpool? He still has a long contract, it is until June 30, 2027. I think Diaz will stay in Liverpool as long as he can play regularly. Diaz becomes an important player for Liverpool, he often contributed well. I think there is no reason that Liverpool will put him on the transfer list, too. Arne Slot has done great jobs so far, he also cares with the players. I never heard bad rumors about the relationship of the players with Arne Slots.