Some lower-league sides just seem to have a fair track record of seeing their best young prospects make the grade in the Premier League. Their talented youngsters make the breakthrough, shine amongst their peers and are quickly snapped up by the big guns.
Crewe Alexandra, Nottingham Forest and Southampton are just a handful of those who have seen their youth players progress to have significant careers elsewhere.
So where do Crystal Palace fit in?
Wayne Routlege left the club in 2005 after making the breakthrough at Selhurst Park as a teenager, with Tottenham signing the then-20-year-old for a fee of around £2 million.
Pacey, direct, agile and comfortable on either wing, Routledge was seen as a real steal by Spurs—but he quickly became a football nomad, taking in seven different permanent and loan spells over the next half-dozen seasons.
Now 28, Routledge has finally settled at Swansea City—the first team he has played 50 league games for since leaving Palace.
John Bostock was, in 2008, labelled by Palace chairman Simon Jordan as "one of the best youngsters in the country" as he left under a cloud for a tribunal-arranged sum of just £700,000—also to Spurs—but almost five years later he has yet to play in the Premier League.
Instead, the latest of his loan spells sees him playing at League One Swindon Town.
More recently, Victor Moses left in 2010 for Wigan Athletic, easing his way to becoming a Premiership regular before a big-money move to Chelsea this summer.
And only a few months ago, two more much-heralded youngsters departed Crystal Palace—Nathaniel Clyne signed for Southampton and is impressing in the top flight, but Sean Scannell, now 22, made the sideways move to Championship side Huddersfield Town.
Only time will tell whether Zaha's move has come too early, leading down the route of Routledge and Bostock, or whether he is genuinely ready for the step up.