Roberto Firmino has confirmed his departure from Liverpool after his stay ends on June 30, and so far Liverpool will only have Darwin Núñez as a centre-forward if they do not find a replacement for Firmino. Darwin Núñez has been very unstable this season, but maybe Klopp will start him as often as possible if Liverpool don't find another striker.
There are rumors about the arrival of a new striker, but so far I think it's just rumours. Liverpool basically have Nunez, but because Nunez's form has been disappointing some times, then Liverpool need to find another striker who can back up Nunez when his form is poor. But I'm sure Nunez will be better next season, but Klopp has to give him a lot of faith.
As of now, we have updates about few players those are going to leave after 30 June but nothing is clear who is coming but behind the scene many things are already under development because Jürgen Klopp and management already understand how worst were things in last season, and now they need to bring few suitable replacements because if they will not do anything surely they will be down and out of the top again which could be disastrous for them.
Even now it's all in history but still departure of Sadio Mané was the biggest shock for them, and they are still feeling the pain, but now they need to look into future which is much better and improved because they are capable of bringing many new quality players, and surely we will have good news in coming weeks before start of the season for the right place in league table in next season.