I'm not sure, Gakpo will replace Nunez's position. except, if Klopp pairs two stickers on the front lines. IMO, Cody Gakpo will play as a winger like his original position when playing with PSV. The presence of Gakpo with The Red is expected to boost the sharpness of their front line. I'm sure it won't take Cody Gakpo long to adapt to Liverpool later. and maybe, his presence at Liverpool will boost Nunez's performance later. or maybe, it could be that Klopp prefers Gakpo as a center forward. after all, he is a young player who is multi-talented and can be placed as a forward striker.
and now, we are just waiting to see which players Klopp will bring to Anfield later. most likely, Klopp will bring in an attacking midfielder. so, it seems that Liverpool are really preparing to restore their performance. especially preparing his troops to face Real Madrid.
On the Madrid side, so far there has been no official statement from El Real to bring in players this January. this is interesting, I want to see Liverpool's performance later, especially in the Champions League.