Tottenham chairman Daniel Levy
Tottenham Hotspur lost out on promising talent Nya Kirby earlier this month, when the teenager decided to switch to sign with Chelsea.
Kirby featured for Chelsea's under-18s in a clash against their Bayern Munich counterparts at the weekend, with his name listed on the teamsheet.
He is also pictured centre wearing the yellow boots, making his debut for the Blues.
He is a loss for Tottenham, as he was so highly regarded, he was picked to train with the Tottenham first team earlier this year ahead of their Europa League clash with Borussia Dortmund, mixing it alongside the likes of Dele Alli and Erik Lamela.
His switch was first reported by Squawka's Greg Stobart, a day ahead of his debut for the Blues in Germany, a game which ended a 1-1 draw.
While obviously a disappointment for Tottenham, perhaps the biggest risk has been taken by Kirby himself.
At Spurs he was already making in-roads towards the first team, and there has been a clear path for young players, demonstrated by the success of the likes of Harry Kane, and last season Josh Onomah featuring, having captained the under-18 team just 12 months earlier.
Tottenham's Josh Onomah in action with Borussia Dortmund's Henrikh Mkhitaryan
Dele Alli and Eric Dier were bought from MK Dons and Sporting Lisbon, but the fact Mauricio Pochettino is willing to make give the young players such key roles has to be encouraging.
Chelsea on the other hand is a much tougher team to make progress in, and the vision of new boss Antonio Conte is yet unclear,
Judging only on what has got on beforehand, Kirby may have joined a team which has enjoyed more success in terms of Youth Cups and UEFA Youth League in recent seasons, but players who starred in these teams have struggled to make the step up.
Chelsea's Lewis Baker has starred for the youth team but first team chances are tough to come by
Lewis Baker and John Swift were prolific two seasons ago in the youth team, but have struggled to get into the first team, while Dominic Solanke is just one of several players who was sent out on loan to Vitesse Arnhem last season.
The glass ceiling has been tough to break through at Stamford Bridge, and despite the chances given to Ruben Loftus-Cheek last season, even his role is yet to be determined due to the change of manager, and it is this instability compared to the settled situation Pochettino has going at Tottenham, which makes Kirby's decision a potential mistake.