The simple answer to that question is, yes.
Clubs are permitted by UEFA to add three new players after the January window for the knockout rounds, irrespective of if they have already played in the competition for another club.
It is similar to that of Luis Diaz, who arrived in January 2022 and was added to the Reds’ squad for the knockout rounds despite playing for Porto in the group stage.
The club named 24 players in their squad for the group stage this season and it will need a tweak to accommodate Gakpo.
Decisions will need to be made as to who drops out with Diaz, Arthur and potentially even Stefan Bajcetic names that could be cut from the 24-man squad named for the first six games.
In simple terms, though, Gakpo can play for Liverpool in the Champions League this season and his place in the squad could even be a straight swap with Diaz.
There’s reshuffling to do and Liverpool have until 11pm (GMT) on February 2 to submit their squad, ahead of the first leg of their last-16 tie against Real Madrid on February 21 at Anfield.