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.
I think the plans will be to go without a striker signing as I have seen Klopp using Carvalho, Jota and Gakpo at this position earlier. So I don't think they are
*actually* looking for another striker at the moment. I think it likely would be Diaz-Gakpo-Salah for Liverpool leading the attacks and maybe Klopp plans to rotate from matches to matches. Also it would be hard currently for Liverpool to actually sell Darwin Nunez and they are not the type of club to sell someone that was brought for a huge fee and take a loss, so I think Nunez will be given fair amount of chances next season as well to develop and showcase his talent. Earlier Klopp also defended the player when fans doubted about his finishing skills, so hopefully Nunez can really show that he was all worth the money Liverpool spent on him.
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.
I think there is no dire need for Liverpool to get a striker but even if they are then I think they are looking for backup player as a striker. So far their main focus has been on midfield in this transfer window.