The summer transfer market has turned up a notch in recent days with the window officially opening last week.
Amongst the moves already made have been several for young players across Europe as team attempt to corral the best starlets as they look to build dynasties, which will win titles for years to come.
It’s hard to put a value on potential leading to outrageous sums being spent on talented teens.
But over at Soccerex, with the help of Prime Time Sport’s Football Value Index, have presented their top 20 Under-21 stars.
The list presents us with the players’ estimated value, which is calculated using a number of factors, including average sale values of their current clubs and their form.
You can check out the brilliant list full of Premier League stars and targeted players above. Click the right arrow above to scroll through…
20. Hector Bellerin (Arsenal) – Value €14,829,000 – Click right to find out the most valuable Under-21 stars – The young Spanish right-back burst on to the scene last season as he capitalised on injuries in the Gunners defence. Mathieu Debuchy and Calum Chambers, both new signings, struggle to maintain their fitness and Bellerin pace, athleticism and defensive qualities proved pivotal as Arsene Wengers men made a late charge for the Premier League title. 19. Calum Chambers (Arsenal) – Value €15,058,000 – Click right to find out the most valuable Under-21 stars – Injuries disrupted his first season at the Emirates but Chambers potential is still recognised by the Soccerex 20 Under-21. Able to play at right-back, centre-back and in midfield, the future is still bright for the former Southampton star, 20, who went to the European Under-21 Championship this summer with Gareth Southgates Young Lions. 18. Divock Origi (Liverpool) – Value €15,261,000 – Click right to find out the most valuable Under-21 stars – After some exciting cameos in Belgiums 2014 World Cup campaign, Brendan Rodgers moved swiftly to sign the 20-year-old forward. As part of the deal he remained with former club Lille last season, but was panned for his performances by LEquipe. He did hit eight goals but his confidence may have taken a blow, but despite this hes still valued highly by Soccerex. 17. Anthony Martial (Monaco) – Value €15,848,000 – Click right to find out the most valuable Under-21 stars – Tottenham Hotspur were keen on the teen forward this summer only to have their hopes dashed as Monaco thrashed out a new deal for their starlet. He will remain in Ligue 1 for another season but if his burgeoning career continues on its upward trajectory then its likely hell soon be moving on. 16. John Stones (Everton) – Value €16,850,000 – Click right to find out the most valuable Under-21 stars – One of the most highly-rated young players in the Premier League, Stones, once of Barnsley, is a talented young defender who is able to play at both right-back and centre-back. Cool on the ball, although at times clumsy with it, he has the potential to be an international star for the next decade. 15. Emre Can (Liverpool) – Value €17,026,000 – Click right to find out the most valuable Under-21 stars – A smart signing from Bayer Leverkusen last summer, the German is probably Brendan Rodgers best buy since Philippe Coutinho. His versatility saw him step into a back-three and perform solidly in what was, in the end, a disappointing campaign for the Reds. With more signings at Anfield, Can could soon be back in a more familiar midfield role, which he occupied for Germanys Under-21s this summer. 14. Anderson Talisca (Benfica) – Value €18,091,000 – Click right to find out the most valuable Under-21 stars – The Brazilian had an excellent first season in Portugal, winning the Primeira Liga title with the Eagles after scoring nine goals in 32 games. Jose Mourinho has already hailed him after English sides missed out on his signature due to work permit issues. It wouldnt be a surprise if his stay with Benfica was short, especially with the player being compared to several top stars such as Neymar and Rivaldo. 13. Aleksandar Mitrovic (Anderlecht) – Value €18,129,000 – Click right to find out the most valuable Under-21 stars – Already being linked with Newcastle, Swansea and Tottenham, the Serbian striker has hit 36 league goals in 69 matches across the last two seasons. A strike against Arsenal in the Champions League increased his fame and a transfer soon seems likely. 12. Youri Tielemans (Anderlecht) – Value €19,392,000 – Click right to find out the most valuable Under-21 stars – The deep-lying playmaker has, despite his tender years, been a star in Belgium for the last two seasons. Hes got an exquisite eye for a pass and at just 18 is also capable of slamming home a long-range strike. Hes another star soon to join Eden Hazard and co. in the Belgian national team and may well be cherry-picked from the Anderlecht side too. 11. Kurt Zouma (Chelsea) – Value €22,726,000 – Click right to find out the most valuable Under-21 stars – Theres more to French starlet Zouma than his monstrous size, hes composed on the ball and his display in midfield against Tottenham in last seasons League Cup final, was superb. Mainly used in cup competitions and as a substitute to help the Blues hold onto wins as they bludgeoned their way to the Premier League title. 10. Aymeric Laporte (Athletic Bilbao) – Value €23,956,000 – Click right to find out the most valuable Under-21 stars – The French starlet is highly regarded over in La Liga and can play at centre-back or left-back, and hes an Under-21 international to boot. Manchester United were keen on the defender but he extended his contract with Athletic, although he does have a 50m release clause if any club fancies taking a punt this summer. 9. Luke Shaw (Manchester United) – Value €25,390,000 – Click right to find out the most valuable Under-21 stars – After an injury hit season, the Red Devils youngster has seen his value depreciate quite considerably. Signed from Southampton for around £28m last summer, his fitness was criticised heavily and hell be hoping for more than the 16 Premier League appearances he made last campaign this time out. 8. Jose Gaya (Valencia) – Value €25,873,000 – Click right to find out the most valuable Under-21 stars – The Spain Under-21 star signed a new contract this summer as Valenica attempt to ward off interest in the prodigious talent theyve nurtured since childhood. Last season was his breakout campaign at the Mestalla as he made 35 La Liga appearance and, so highly-rated is the player, theyve slapped a 50m release clause in his new five-year deal. 7. Mateo Kovacic (Inter Milan) – Value €26,137,000 – Click right to find out the most valuable Under-21 stars – At just 21, Kovacic is already a seasoned professional with two league titles, won with Dinamo Zagreb, to his name. His spell in Italy is yet to garner any silverware but with the Serie A side already signing Miranda, Geoffrey Kondogbia and Martin Montoya, they could well challenge this time out. Inters ambition spending could well tempt Kovacic to remain with them despite interest from Liverpool. 6. Hakan Calhanoglu (Bayer Leverkusen) – Value €27,431,000 – Click right to find out the most valuable Under-21 stars – Free-kick master and creative outlet, Calhanolgus first season with Leverkusen was impressive and there is still more to come from the 21-year-old attacking midfielder. 5. Jose Gimenez (Atletico Madrid) – Value €30,205,000 – Click right to find out the most valuable Under-21 stars – Signing the Uruguayan centre-back for 1m in 2013 now appears a canny piece of business by Atletico. His performances at the back last season have seen the club sell Miranda to Inter Milan this summer as they look to bring through the 20-year-old, who represented his current at the Copa America this summer. 4. Domenico Berardi (Sassuolo) – Value €30,521,000 – Click right to find out the most valuable Under-21 stars – Already wowing fans in Serie A, the talented forward is capable of both scoring and assisting, having netted 15 times last season and laid on 10 goals for team-mates. Sassuolo now fully own the player after they gave Juventus 10m to end their co-ownership. 3. Memphis Depay (Manchester United) – Value €33,640,000 – Click right to find out the most valuable Under-21 stars – The Red Devils moved swiftly this summer to land their top target from PSV Eindhoven, but Soccerex reckon they may have overpaid a touch. The Dutch winger was sensational in his homeland last season, leading his side to the Eredivisie title, and netting 22 league goals. 2. Marquinhos (Paris Saint-Germain) – Value €39,768,000 – Click right to find out the most valuable Under-21 stars – The versatile defender has been with PSG for two campaigns now but is finally making his impact on the first-team after making 21 starts last season. Able to play a full-back or in the centre of defence hes highly valued by his club too as they gave him a one-year contract extension in March. 1. Raheem Sterling (Liverpool) – Value €49,295,000 – The wantaway starlet didnt quite have the same impact last season as he did in the Reds 2013/14 campaign, but that hasnt stopped him being rated the most valuable Under-21 star in Europe. A move to Manchester City seems like Sterlings most viable move this summer but it will likely cost Manuel Pellegrini more than the amount Soccerex believe him to be worth.