Manchester United have completed the £36m signing of Monaco forward Anthony Martial, making him the world's most expensive teenage footballer.
The fee could rise to £58m.
France Under-21 international Martial, who scored eight goals in 31 Ligue 1 games last season, signed a four-year deal with the option for a fifth year.
The 19-year-old, who had been linked with Arsenal, becomes United's third most expensive signing after Angel Di Maria (£59.7m) and Juan Mata (£37.1m).
He was allowed to leave the France squad on Monday for a medical with Louis van Gaal's side, who have given him the number nine shirt.
Monaco signed Martial for £4.4m two years ago from Lyon, who will receive about £7.35m as a result of a sell-on clause.
Conditions that would increase the fee include Martial winning the Ballon d'Or award for the world's top footballer.
The previous world record transfer fee for a teenager was £27m, which United paid for Southampton left-back Luke Shaw last summer and Paris St-Germain spent on Roma centre-back Marquinhos in 2013.
His signing came as Premier League spending passed £850m for the first time in a transfer window.
The Most Expensive Teenagers In World Football
The Biggest Club In The World'
"I am so excited to be joining Manchester United," said Martial. "I have always wanted to play in the Premier League and to join the biggest club in the world is what every young footballer dreams of.
"I am looking forward to meeting my new team-mates and working with Louis van Gaal, who has achieved so much in his career."
Manager Van Gaal said: "Anthony is a naturally talented, young, multi-functional forward with great potential. We have been watching him for a while now and he has developed immensely during his time at Monaco.
"He has all the attributes to become a top football player; however we need to give him time to adjust to his new environment and the rhythm of the Premier League."
Monaco vice-president Vadim Vasilyev said: "We wished to keep him this season but Manchester United made an incredible offer that neither Anthony, nor AS Monaco, could refuse."
Who is Martial?
A France Under-21 international who has just been called up to the senior national team for the first time.
He scored 32 goals in 21 games at youth level for Lyon before breaking into the first team in the 2012-13 season, making three appearances before joining Monaco.
Martial scored two goals in 15 games in his first season at Monaco and 11 in 42 in all competitions last season.
With nine goals, he is the top teenage scorer in Europe's top five leagues since the start of 2014-15.
In a July 2015 study by the Soccerex 20 Football Value Index, Martial was ranked the 17th most valuable under-21 player in Europe at £11.6m.
(Source:http://www.bbc.com/sport/0/football)
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