The midfielder headed for Bournemouth earlier this month.
Leeds United have been very busy in the transfer market this month, with plenty of exciting arrivals at the club to begin the Garry Monk era.
Lewis Cook in action with Henri Lansbury of Nottingham Forest
The England youth international was out of contract this summer and it seems the club decided to cash in on his services whilst they still had the opportunity.
Now a report in the Yorkshire Evening Post has made it quite clear how difficult it would have been for Leeds to convince Cook to stay at Elland Road on a financial level.
Lewis Cook in action with Derby's George Thorne
The report, which claims that Leeds could receive up to £10 million for the transfer, suggested that Cook will now be making five times as much at Bournemouth than he was at Leeds – with his weekly salary bumping to over £30,000-a-week from the £6,000-a-week he was on in Yorkshire.
Bournemouth manager Eddie Howe and players applaud fans
Leeds are surely not in the position currently to have paid Cook, despite his immense talent, that sort of salary.
With the promise of Premier League football also a major factor, not to mention the topsy-turvy recent history of Leeds, keeping hold of Cook was nearly an impossible task for Leeds.