However, with 30 goals in 36 games this season, Salah has lit up Anfield and significantly softened the blow of losing Philippe Coutinho to Barcelona for £142 million.
Liverpool haven't won a trophy since 2012 and this season their hopes of silverware rest on winning the Champions League, where they are nearly certain to reach the last-eight due to their 5-0 first leg lead over Porto.
When asked if Salah had the best left foot in football Klopp said: "Hopefully".
"But, do we want to keep the players together?"
Mane has proven his worth following a £30million switch from Southampton in 2016, and the 25-year-old is expected to net a double-your-money deal.
'I came to here to win titles, ' Salah told BBC Football Focus.
"I really want to use this base and for that we have to be at our best tomorrow".
Klopp said: "It was a long time".
Klopp said: "I am really happy we didn't have to play immediately after the Porto game, because it would have been quite hard from this big result and a good game from our side".
The only injury absence is defender Nathaniel Clyne, who is recovering from a back problem.West Ham striker Javier Hernandez believes the 2-0 home defeat of Watford last time out has strengthened the belief among David Moyes's men that they can get something from the trip to Merseyside. Liverpool took advantage of a nine-day break without a match after last week's thumping Champions League victory over Porto to head to Spain for a short training camp. They are getting good results, (Marko) Arnautovic flying.