Tottenham Hotspur's club-trained and foreign player issues have long been an issue at the club but they have only got worse for the coming season.
One of the key areas Spurs fall down on when it comes to European competition is 'locally-trained' players, those senior players who have been on the club's books for three entire seasons or 36 months between the ages of 15 and 21. Tottenham have sold such players like Harry Kane, Harry Winks and Oliver Skipp in recent seasons, but it will be some time before the current crop of younger players make it into that category.
Goalkeeper Alfie Whiteman and midfielder Max Robson have left the club at the expiry of their contracts in recent days which means Brandon Austin is the only senior non-Under-21s player to fit the 'locally-trained' category.
Here's what the squad numbers mean for Tottenham and their squads for both the Premier League and the Champions League.
Premier League
For a start, let's take Fraser Forster, Timo Werner, Whiteman, Sergio Reguilon out of the squad. However, there is another issue because four players must come out of the Under-21s list and into the main lists, namely Antonin Kinsky, Alejo Veliz, Josh Keeley and Matthew Craig.
There is still plenty of space here though, especially when you look at players who are unlikely to be at the club next season. That's mainly because a club's Under-21 players do not need to be included on their 25-man squad list yet are eligible to play in the Premier League.
To be considered an Under-21 player for this current Premier League season, players must have been born on or after January 1, 2004. That means Mathys Tel, if he remains at the club, does not have to be registered in the main squad and neither will the incoming Luka Vuskovic, nor the returning Yang Min-hyeok.
It also appears that Danso qualifies as a homegrown player in Premier League terms because he was in the youth academies at Reading and MK Dons for years before leaving England at the age of 16 and later returning for a season at Southampton.
The Premier League rules state that "a 'Home Grown Player' means a player who, irrespective of nationality or age, has been registered with any club affiliated to The Football Association or the Football Association of Wales for a period, continuous or not, of three entire seasons, or 36 months, before his 21st birthday (or the end of the season during which he turns 21)."
With that in mind, here's how the club's Premier League squad looks right now, including players returning from loan and before anyone else leaves.
Premier League non-homegrown players (16 currently, 17 maximum allowed): Guglielmo Vicario, Pedro Porro, Radu Dragusin, Destiny Udogie, Cristian Romero, Micky van de Ven, Rodrigo Bentancur, Yves Bissouma, Dejan Kulusevski, Richarlison, Son Heung-min, Pape Matar Sarr, Manor Solomon, Bryan Gil, Alejo Veliz, Josh Keeley.
Premier League homegrown players (7 currently and eight minimum required): Dominic Solanke, Kevin Danso, Brandon Austin, Ben Davies, James Maddison, Brennan Johnson, Djed Spence.
Notable Under-21s players: Archie Gray, Lucas Bergvall, Wilson Odobert, Mathys Tel, Dane Scarlett, Yang-min Hyeok, Luka Vuskovic, Ashley Phillips, Alfie Devine, Jamie Donley, Alfie Dorrington.
Champions League
Now here's where things become an utter pain in the backside. This area has been a constant problem for Spurs and will continue to be for a while longer until the recent batch of 18-year-old signings eventually become club-trained players three years down the line from when they joined.
The problem in the Champions League, as it did in the Europa League, lies in the fact that UEFA's rules state that no club can have more than 25 players on their A-List during the season, of whom at least two must be goalkeepers. The rules then say that "as a minimum, eight of those 25 places are reserved exclusively for 'locally trained players' and no club may have more than four 'association-trained players' listed among those eight places. If a club have fewer than eight locally trained players in their squad, then the maximum number of players on List A is reduced accordingly".
What is a locally-trained player? Well, there are two different kinds. One is 'club-trained players', those on a club's books for three entire seasons or 36 months between the ages of 15 and 21. The other is 'association-trained players', who were on another club's books in the same association for three entire seasons or 36 months between the ages of 15 and 21. Danso will not fit into that latter category because he left England at the age of 16.
Then there is a B-List for players born on, or after, January 1, 2004 and who have been eligible to play for the club for any uninterrupted period of two years since their 15th birthday – or for a total of three consecutive years with a maximum of one loan period to a club from the same association for a period not longer than one year. Players aged 16 may be submitted if they have been registered with the club for the previous two years without interruption.
So with all that in mind, Spurs' Champions League squad in its current state pre-window is overstuffed in both non-locally trained spots and association trained ones.
That they only have one club-trained player in goalkeeper Brandon Austin when they need to register four, means Tottenham would have to leave three spots open in what should be a 25-man squad, but instead becomes a 22-man one.
Players like Dane Scarlett, Jamie Donley and Alfie Devine could go on the B list if required as they meet those requirements. There's no point putting them in the club-trained players spots really because they don't need to.
So if Mathys Tel were to stay then Spurs have 24 players to fit into 17 non-locally trained spots and six association-trained players for four other spots. Any association-trained players over those four spots would then need to be crowbarred into the main group.
In essence, the easiest way to look at it is that Spurs currently have 30 senior players to fit into 22 spots and that's before they even try to sign new players this window.
So once again plenty of work is going to be need to be done on that squad during this summer window with the knowledge that players are still likely to be left out of the Champions League squad because you need a bigger squad to compete in all four competitions but Tottenham don't have the club-trained numbers to make that work in Europe.
European non-locally trained players (24 currently, 17 maximum): Guglielmo Vicario, Antonin Kinsky, Pedro Porro, Kevin Danso, Radu Dragusin, Destiny Udogie, Cristian Romero, Micky van de Ven, Rodrigo Bentancur, Yves Bissouma, Wilson Odobert, Dejan Kulusevski, Richarlison, Son Heung-min, Pape Matar Sarr, Lucas Bergvall, Mathys Tel, Manor Solomon, Bryan Gil, Alejo Veliz, Yang-min Hyeok, Luka Vuskovic, Ashley Phillips, Josh Keeley.
Association trained players (6 currently, four can be used in exclusive slots): Dominic Solanke, Ben Davies, James Maddison, Brennan Johnson, Djed Spence, Archie Gray.