Everton's academy talents played a crucial role in England's under-20 World Cup win last summer, with the club's investment in youth paying dividends for the country.
But the Toffees overlooked the chance to sign the captain of the side, Bournemouth's Lewis Cook.
Speculated at around £10 million, Cook went onto sign for Bournemouth months later for a fee of £6 million plus add-ons.
Cook's first season at the Cherries was blighted by injuries but he is back playing regularly now, earning a senior international cap with England.
Everton's failure to land the midfielder is highlighted even more so by the fact they went on to spend considerably more on Morgan Schneiderlin months later.
The Toffees paid £24 million to sign Schneiderlin from Manchester United, and he has been a big disappointment.
The Frenchman is eight years older than Lewis Cook and Everton have missed a real chance to bring the youngster in alongside their glut of blossoming English talent.
It looks at this point to be a terrible error, and Cook continuing to reach new heights will highlight Everton's regret.