The 10 other most expensive teenagers in world football
Luke Shaw – Southampton to Manchester United - 2014
The 18-year-old left back impressed under Mauricio Pochettino at Southampton. He played 38 games for the Saints last season and 28 in 2012/13 but is yet to register a goal at professional level. He picked up his first three caps this year under Roy Hodgson and was a surprise inclusion in the England squad for the Brazil World Cup, taking Ashley Cole's seat on the flight to Rio.
Wayne Rooney – Everton to Manchester United (2004)
Price: €37m (£30m)
Shaw's new team-mate broke the bank when he joined the Red Devils from the Toffees at the age of 18. He announced his arrival in style with a memorable hat-trick against Fenerbahçe in the Champions League before going on to score 216 goals in 440 appearances for United, and will likely eclipse Bobby Charlton's record tally of 249 now that he has signed a £300,000 a week five-and-a-half-year contract.
Javier Saviola – River Plate to Barcelona (2001)
Price: €35.9 (£29m)
Anyone who played Championship Manager (as it was then known) in the late-nineties and early-noughties will have made a concerted effort to sign the Argentine striker, who inevitably became the most prolific goalscorer on the game. Sadly he never became quite so unplayable in real life. After arriving at the Camp Nou aged 19, he averaged a relatively mediocre 20 goals per season and was loaned out by the demanding Catalans for the remainder of his contract before signing for Real Madrid on a free transfer in 2007.
Anderson – Porto to Manchester United (2007)
Price: €30m (£25m)
Sir Alex Ferguson will want to forget everything he can about this signing – assuming he hasn't already. The Brazilian playmaker never got going at Old Trafford and was shipped off to Fiorentina on loan last season but only made seven appearances.
Marquinhos – Roma to Paris Saint-Germain (2013)
Price: €31.4m (£25m)
Funded by Qatari billions, PSG made a huge statement with their signing of the 19-year-old Brazilian wonderkid, the most expensive defender on this list. He scored on his debut and has forged a formidable partnership with compatriot Thiago Silva, who himself arrived for an enormous fee (€42m).
Antonio Cassano – Bari to AS Roma (2001)
Price: 60bn Italian Lire (£24m)
Italy's veteran forward, now 32, was a sprightly 19-year-old when he joined up with Francesco Totti in the capital. He scored just five goals in his first season, openly clashed with boss Fabio Capello and only managed 39 goals in 118 games before Real Madrid took the controversial star off their hands for just €5m in 2006.
Sergio Ramos – Sevilla to Real Madrid (2005)
Price: €27 (£22m)
Having been named La Liga's breakthrough player of the year, Ramos became the youngest ever Galactico when he commanded such a huge transfer fee at just 19. He has been imperious for Los Blancos ever since, making 287 appearances and contributing 36 goals from the back, and was instrumental in Spain's two World Cups and one European Championships between 2008-2010.
John Obi Mikel – Lyn to Chelsea (2006)
Although Manchester United thought they had signed him for for £4m in 2005, the 19-year-old Nigerian holding midfielder ended up with the Blues after they paid the Red Devils £12m to drop their option on the player and sent a further £4 to Lyn to capture his services. He cried the day he joined Chelsea as he had dreamed of the move to Old Trafford but has been a mainstay ever since, clocking up 206 appearances but just one goal.
Alexandre Pato - Internacional to AC Milan (2007)
Price: €22m (£15m)
Pato was so young (17) when he signed for the Milanese that he was unable to play official matches for six months due to FIFA regulations on non-EU minors. Despite showing a great deal of promise and racking up 51 goals in 117 appearances, the Brazilian was sold to Corinthians in 2013 for €15m (£12m) and now plays on loan at Sao Paolo.
Romelu Lukaku – Anderlecht to Chelsea (2011)
Price: €22m (15m)
Chelsea shelled out a huge fee and a five-year contract for the 18-year-old Belgian but gave him just 10 appearances before loaning him out to West Brom and Everton and, despite impressing during both spells, he is seemingly on Jose Mourinho's 'to-flog' list, although his dismal World Cup showing won't have done his price tag any favours.
Sergio Aguero – Independiente to Atletico Madrid (2006)
Price: €21m (£16m)
Aged 18, The explosive Argentinian forward became the spearhead of Atletico's attack, replacing Fernando Torres as their talisman after the Spaniard's 2007 move to Liverpool. Before his £35m move to Manchester City, he won the UEFA Europa League and the UEFA Super Cup with the current La Liga champions.