I agree that although it is certain that Mane will leave Liverpool, it is very likely that Klopp will be able to find players who can replace Mane because so far if we look at some of Klopp's purchases of players almost all of them have proven effective, such as the purchase of Thiago, Jota, Luis Diaz and Konate although bought at a price that is not too expensive but under Klopp's guidance they were able to play brilliantly.
I'm sure Klopp will find a better replacement than Mane and also Klopp has the ability to develop strategies for each player to be more agile and able to compete with star players, but nevertheless he must find players who have skills in him before being trained in new strategies by Klopp.
Liverpool squad now has almost equal quality, although Mane leaving I don't think it will have much effect on Liverpool's performance next season, for the place that Sadio Mane might leave it is very possible to be covered by Luis Diaz whose performance is getting better with Liverpool.
now Liverpool already have character under Jurgen Klopp where they don't depend on one or two of their main players.
Sadio Mane going is a sad one already for Liverpool but if Salah joins him, it would be a disaster. In as much as most Liverpool fans want to believe that the team now has a DNA that has been configured by Jurgen Klopp but I want to remind them that the only reason Liverpool lose out on the EPL title was the games they dropped points when Salah and Mane was away for AFCON. If they had those maximum points, they might have probably be the EPL title holders. Some persons are saying Diaz is Mane's replacement