Manchester completed the signing of 19-year-old forward Gabriel Jesus from Brazilian club Palmeiras in a deal reportedly worth £27million.
As a result, the player dubbed the ‘new Neymar’, due to his playing style and bundles of talent, is one of the most expensive teenagers in world football.
Where does the fee paid for the Brazil under-23 international on the all-time list, though?
FOX Sports Asia investigates…
(Not all transfer fees are confirmed, some were undisclosed so we have gone with the figure most often reported in the public media)
Antonio Cassano (Bari to Roma, £20m)
Soon to be Italian international Cassano became the most expensive teenagers in the history of football when he signed for the Giallorossi in 2001.
A precocious talent with sublime technical skill, Cassano arguably never really delivered on his early promise and spent relatively short times at Real Madrid, AC Milan and Internationale after leaving Roma in 2006 for just €5M.
Where is he now? After being released by Parma in January 2015, Cassano rejoined another of his former clubs, Sampdoria in a two-year deal in August that year.
Marquinhos (Roma to PSG, £22m)
After impressing for Corinthians in his home country of Brazil and then Roma, cash-flush French side Paris Saint-Germain beat out the likes of Chelsea for the highly rated centre-back in 2013.
A pacy defender equally comfortable with the ball at his feet or in the air, Marquinhos has often been compared to his teammate for club and country, Thiago Silva.
Where is he now? Still at PSG and seemingly with the world at his feet, after winning 10 pieces of silverware for the Parisian side in his three years there.
Sergio Ramos (Sevilla to Real Madrid, £22m)
Ramos became the most expensive Spanish teenager in history when the Merengues paid the hefty sum for the versatile defender.
Equally as likely to score at the right or wrong end, Ramos often played at right-back or defensive midfield, but as he matured as a player was trusted at the heart of the Madrid defence more and more.
Where is he now? Still at Madrid, in fact, he was named the captain of the side following Iker Casillas departure last year, and one of the most respected defenders around.
Javier Saviola (River Plate to Barcelona, £25m)
After becoming the youngest player to win the Golden Boot award in Argentina in 2000, Saviola was signed by the Catalan giants as a potential partner to Patrick Kluyvert.
Regarded as the heir to the throne to Diego Maradona thanks to his sublime dribbling ability and goal-scoring prowess, Saviola never really settled in Barcelona. After spending time on loan at Monaco and Sevilla, he joined Real Madrid on a free transfer in 2007.
Where is he now? After stints at Malaga, Olympiacos and Verona, Saviola returned to River Plate in 2015. He went goalless in 13 appearances during the second stint at the club of his youth and is currently unattached, with rumours of retirement rife.
Anderson (Porto to Manchester United, £25m)
Man United’s signing of Anderson as a 19-year-old from Portuguese giants Porto is a clear case of the risks attached to signing a player who is still learning their trade.
Initially, the Brazilian looked like an astute signing for Sir Alex Ferguson’s side after impressing in a box-to-box role but soon fell out of favour largely due to various behavioural issues.
Where is he now? Back in his home country, where he has been capped 30 times for Internacional since returning to Brazil in 2015 following an unimpressive stint at Fiorentina.
Wayne Rooney (Everton to Manchester United, £26m)
A versatile forward, Rooney made his debut for the Toffees as a 16-year-old in 2002, but after two seasons showcasing his sublime talent made the move to Manchester United having been capped by England already.
The goals continued to flow for Rooney for the Red Devils, although as he got older he has been used in a midfield role for both club and country.
Where is he now? Captain of Man United with 177 goals for the club to his name – the most of any player for a single English club.
Renato Sanches (Benfica to Bayern Munich, initial fee of £27.5m)
Often likened to Dutch legends Clarence Seedorf and Edgar Davids, the 18-year-old Portuguese international became the youngest player from his country to leave its domestic league in the 2016 summer transfer window.
After being crowned the Young Player of the Tournament during the recently-completed European Championships, Sanches has the world at his feet.
Where is he now? Since he hasn’t made his full debut for Carlo Ancelotti’s side yet, the jury is till very much out on midfielder, but the early signs are very promising.
Lucas Moura (Sao Paulo to PSG, £28m)
A diminutive but skillful wide player, Moura is another of the high-profile youngsters signed by PSG since the club was purchased by Qatar Sports Investments five years ago.
Since moving to the French capital in 2013, the Brazilian has established himself for the Selecao playing predominantly on the right wing, although he has on occasion been used in other midfield positions or even as a striker.
Where is he now? A key member of the PSG squad that has dominated the French league this decade.
Luke Shaw (Southampton to Manchester United, £31m)
A highly-rated left-back, Shaw remains the most expensive English teenager following his move to the Old Trafford as a 19-year-old in 2014.
Equally comfortable tracking back or joining the attack, Shaw has been likened with Gareth Bale, another former Southampton youth product, for his speed and decision-making skills.
Where is he now? At Manchester United, although the broken leg he suffered at the start of the 2015/16 season stunted his development somewhat.
Anthony Martial (Monaco to Manchester United, £36m)
The honour, however, dubious it might be, of being the most expensive teenager belongs to Martial, after he made the move to the Old Trafford club at the start of last season.
Often compared to Arsenal legend Thierry Henry for his speed and technical ability both up front and in wide positions, Martial adapted well to English conditions, scoring 17 times in all competitions for his new club.
Where is he now? Still attempting to establish himself as a key player for Jose Mourinho’s side, Martial certainly has all the tools to be one of the world’s best.