Liverpool appeared to strike gold earlier this season when summer signing Joe Gomez made an instant impact in the first team.
A £3.5 million signing from Charlton Athletic, he was able to make an immediate step up, and kept former Sevilla Europa League winner Alberto Moreno out of the side, who had cost six times the price.
Gomez would later suffer a season ending knee injury while on under-21 duty with England, but the 18-year-old's talented displays will only have encouraged Liverpool's transfer committee to consider more signings from the Championship.
A switch to United is unlikely for Leeds boy Cook, but there is not the same vitriol between Leeds and Liverpool, instead he would have the opportunity to play alongside a player he would have admired growing up, former Whites youngster James Milner.
While Leeds have been inconsistent over the past season and a half Cook has been playing, the teenager has been outstanding, an ever present in the side when fit.
He is unafraid to get stuck into the physical side of the game, and his displays in defensive midfield have too seen him called up by England's youth sides.
Cook would not come as cheap as Gomez did, with The Star speculating a fee could be £10 million - but in reality to Leeds United he is priceless in terms of their future plans to build the team around him.
Negotiating would clearly be difficult, but if Liverpool could pull off a deal, there is real reason to believe based on his 51 Championship appearances for Leeds so far that he is capable of establishing himself as a regular in the Liverpool midfield if allowed the opportunity for a run of games to show what he can do.