Origi leaving, Mane leaving, if Salah probably leaves it'll be a bad move for Liverpool.
As they don't have good backings to fill the space for this player's, good player's bare been replaced but it's takes time.
Diaz can replace Mane, who will replace Salah of he leaves?
It is said that Mane will be basically "traded" in a sense, because Mane worths a lot of money and Bayern is not willing to pay that much, Liverpool also doesn't want to let him go for nothing and that means they can force him to play at least another season if they want to, instead of getting paid almost nothing, they would at least get another season out of him.
So, what Bayern needs to do is give something in return, and the talks have been about Lewandowski. It could be a straight up trade, but I am not sure if that would mean Bayern would get that much better, it would have been better if they had Mane AND lewa at the same team to play together for a few seasons.