31 Jul, 18:00
The 2017 Soccerex report by Prime Time Sport has calculated the worth of the 10 most valuable Under-21 players in the world.
It notes, 'The Football Value Index by Prime Time Sport is a best-in class player valuation methodology, used by football clubs and the sport industry, to obtain an independent and accurate valuation of football players.'
The report takes into account such things as average player sale value by current club, average player sale value by comparable clubs, market value perception, position on the pitch, age and contract length, as well as on-field performance and media value to calculate the figures.
Here's a look at the rising stars who made the cut…
10. Kingsley Coman - €35.1m
Bayern Munich & France
Kingsley Coman's second season at Bayern Munich wasn't quite as good as his first - injuries played a part in that - but he's still considered one of Europe's most exciting talents.
His move to Bayern is now permanent after the initial two-year loan and by the age of 21 he has already played for three European giants. Paris Saint-Germain, Juventus and his current side - Bayern Munich.
9. Timo Werner - €35.6m
RB Leipzig & Germany
Timo Werner scored the goals that drove RB Leipzig to second place in the Bundesliga last campaign, securing an automatic Champions League qualification in the club's first top flight season - quite a successful one to say the least.
Previously of home-town club Stuttgart, the striker had only netted 13 league goals in three seasons before 2016/17, but enjoyed a real breakthrough year to score 21.
8. Gianluigi Donnarumma - €40.6m
AC Milan & Italy
Gianluigi Donnarumma has remarkably been a regular starter for AC Milan since the age of 16, an incredible feat for any player, let alone a goalkeeper.
Still only 18, his physical frame and stature belies his youth and he is already tipped to be the Italian national team's long-term successor to legend and namesake Gianluigi Buffon.
7. Marcus Rashford - €40.7m
Manchester United & England
Injury to others was what presented Marcus Rashford with his initial Manchester United chance a little over 17 months ago, but ability and determination are what have made the home-grown striker flourish since then.
He grabbed his opportunity with both hands and even seems to have won the trust of Jose Mourinho, a manager previously infamous for his lack of faith in young players.
6. Gabriel Jesus - €42.6m
Manchester City & Brazil
Injuries aside, Gabriel Jesus made a flying start to his Manchester City career after arriving in England in January and could potentially even replace Sergio Aguero as the club's main man over the next 12 months.
The 20-year-old is the most talked about Brazilian talent since Neymar and appears to have the right mentality and attitude to compliment his vast technical ability.
5. Marco Asensio - €42.7m
Real Madrid & Spain
After loans at Espanyol and Mallorca, Marco Asensio finished his debut season in Real Madrid's first-team with La Liga and Champions League medals, even scoring in the UCL final against Juventus.
He'll hope for an even bigger role with Los Blancos in 2017/18 as he looks to establish himself as one of the best midfielders in Europe in the coming years.
4. Leroy Sane - €51.2m
Manchester City & Germany
Manchester City did well to snap up Leroy Sane for £37m last summer given the way his value has inflated over the 12 months since he joined the Manchester outfit. He promises to get even better in 2017/18.
A slow starter while he settled, the youngster caught fire in the second half of the 2016/17 season and has been tipped by Michael Ballack to be the future of the German national team.
3. Ousmane Dembele - €60.9m
Borussia Dortmund & France
Former Rennes prodigy, Ousmane Dembele is thought to have chosen Dortmund over Barcelona last summer because of the greater gametime on offer at the Signal Iduna Park.
It certainly proved to be a smart decision as the young winger went from strength to strength in the Bundesliga and has seen his reputation and value soar even more as a direct result.
2. Kylian Mbappe - €61.8m
AS Monaco & France
Kylian Mbappe took European football by storm last season as he inspired Monaco to a first French title since 2000 and a first Champions League semi-final appearance since 2004.
The teenage forward only celebrated his 18th birthday a few days before Christmas, but finished the campaign with 26 goals in all competitions and Europe's biggest clubs on his tail.
1. Dele Alli - €82.6m
Tottenham Hotspur & England
Spurs snapped up a teenage Dele Alli for just £5m from MK Dons in 2015 and have seen the midfielder develop into one of the best players in the Premier League in just two seasons.
He scored 22 goals in all competitions last season and at the age of just 21 has the potential to be the future of English football. The likes of Real Madrid and Barcelona have been linked with a move.