Liverpool still have no striker signing on their agenda currently. However Firmino's absence must push them to look for a replacement. They can't move on to the next season with only one striker in the end. Nunez's possible injury can cause us to see Gakpo as a centre-forward again. This wouldn't be much ideal for Liverpool at all.
If they don't want to spend so much money on a striker than they can look for a loan option or a favorable low-cost striker as a subtitute of Nunez. Nunez will also need to make some good improvement this season to prove his skills to Liverpool as well.
So far, Liverpool haven't recruited a centre-forward after Firmino left, even though they have to do it if they want to return to competing in the top 4 next season. But neither should we underestimate the strength in the depths of Liverpool current squad, as Nunez, Gakpo and Salah will probably make a bigger difference to their form up front for Liverpool next season. In addition, Nunez is expected to perform better than his first season with Liverpool because he is still trusted by kloop to show his quality next season.
Szoboszlai and Alexis Mac Allister are two recruits who are good enough to add thrust in building attacks. It is estimated that these two players will be able to make Liverpool strong again next season, especially for Szboszlai he is still quite young and can be projected for the long term in the Liverpool team.