The French forward moved to Old Trafford on deadline day, costing an eye-watering £58 million according to the Daily Mail.
The deal was confirmed by United on their official Twitter account, with the 19-year-old becoming both the most expensive teenager and the most expensive French player in history when he completed the switch to the Premier League.
— Manchester United (@ManUtd) September 1, 2015
The fee is an astronomical one for a player who has only one full season of league action under his belt, who is yet to ever score double figures in a league campaign and who is yet to make his international debut.
It was a fact acknowledged by United great and Sky Sports pundit Gary Neville, writing on his official Twitter account. The former right-back expressed some tactic optimism that, despite the burden of the fee, Martial could go onto be a success at Old Trafford.