I don't know how authentic is the news about Mo Sallah leaving the club but regardless, having alternatives is very necessary and their defense needs serious attention too. I'm not trying to downgrade their current defenders but Vigil is not as strong as before and possible replacement should be in place in case of any misfortune. Arne slot seems to be satisfied with the present squad and will definitely figure out how he can get desired results with them.
I think the owner doesn't really like spending to be fair, can't say anything even if you have a great scouting team when your owner don't give you money to buy players. I honestly believe this is why they brought in Slot, so that they can use their young players more instead of buying players. Not sure what their target for next season is, but I don't think the owner aim for something as big as a quadruple charge or something similar. They really want to maximize profit as much as possible without hurting the team too much. Not sure if fans will like it tho.
In the last few seasons we have seen that Liverpool have only sold their players but on the contrary they have not bought any players. Mohamed Salah is Liverpool's best player no doubt but there are rumors of this player leaving the club although this rumor is not new we saw in the transfer window last season there were many positive hints about this player leaving the club but in the end he stayed at Liverpool. There have been reports in the media that Liverpool will let him go this season, although these are rumours. But before a deal is done, there are rumors and then the deal is done.
If Mohamed Salah leaves Liverpool and goes to another club, Liverpool's forward lineup will be very weak and it will be a challenge for the manager to do well in Premier League or Champions League with this weak lineup. The transfer window is still open and if Mohamed Salah does indeed leave the club, we will definitely be waiting to see who will come to Liverpool next.