The young striker arrived for an initial £36 million on transfer deadline day.
Signing the player in itself was not a shock. The teenager has an abundance of talent and could become a leading striker in world football in years to come. The price tag however certainly seemed to be a massive talking point.
Martial cost the club a reported £36 million up front and it could eventually rise to £58 million, as reported by The Guardian.
The Frenchman had to leave the French national team camp to sign the deal, where he is of course training alongside a fellow United newbie. Martial is hoping to make his international debut against Portugal in Lisbon tonight.
Morgan Schneiderlin posted this Tweet earlier today, showing an image of him and Martial in training together ahead of the game, as the pair appear to get to know each other ahead of becoming club-mates:
Schneiderlin himself cost United a reported £24 million, rising to £27 million, according to The Guardian.
That means this picture highlights a current investment of £60 million, potentially rising to £85 million.
Quite a gamble in young French talent from The Red Devils.