Lewis Cook was Leeds United's great hope before he was sold to Bournemouth in 2016.
Leeds cashed in on the young midfielder, fearing losing him on a free, earning £6 million on a deal which could yet rise based on add-ons.
Yet despite selling Cook, Leeds managed to cope admirably, to the point that the midfielder was not missed at all in the subsequent season as Garry Monk found a way to work around it.
New manager Thomas Christiansen however could really do with Cook in his side.
In recent games Leeds have been exposed in midfield, too reliant to flair players, and they are lacking an enforcer.
This is partly due to the sale of Liam Bridcutt to Nottingham Forest, who Christiansen did not rate.
Combined with the sale of Lewis Cook a year ago, and Leeds look exposed in a key area where they were previously solid.
Cook himself has had a very frustrating time at Bournemouth, missing time through injury in his debut season and being overlooked for loanee Jack Wilshere.
Cook made his first Premier League start of the season last weekend for the Cherries and may finally be working his way back into favour.
If he can't get into Bournemouth's side, then it will be a waste, and give Leeds even more reason to regret his departure.