In everything Liverpool want to do this summer, they can't ever afford to lose both Salah and Mane. Without those two, the club will struggle in the league. Salah and Mane are players that are difficult to replace. If they lose those two, then probably they have to change the strategy in order to get results.
During play for Liverpool these players has been showed fantastic performance and help Liverpool to get trophies and indeed i admitted if Salah and Mane leave the club this probably big lost for Liverpool and will have an effect on Liverpool's performance for next season especially besides them there are several players who possibly will leave too such as Firminho and Origi but Klopp is smart manager and i think he already considering this possibility however seems Liverpool have started looking for new players to replace Mane and names like Jeremy Doku or Darwin Nunez were linked to them
I think keeping up with Liverpool's performance for next season is upto Klopp to figure it out. Mane and Sallah will be a big loss to the club but the too have to move on. Their performance in the last season was second to none but at the same time Liverpool can still do better without them it is just for Klopp to figure out how.