The news provoked media and fans to question why United, and indeed Louis van Gaal, would take such a big-money gamble on a widely unknown and unproven footballer on the world stage, though the Dutch manager appeared keen to express what attracted him to the signing.
Speaking to Manchester United's official website, he said: "Anthony is a naturally talented, young, multi-functional forward with great potential."
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It falls well within the bounds of belief that Van Gaal has looked at this as a long-term investment, yet the investment also risks emulating that of the high-profile signings of Radamel Falcao and Angel di Maria, who infamously flopped in their debut season at Old Trafford.
And at £36 million, Red Devils fans will be expecting the Frenchman to make an immediate impact and justify his incredible transfer fee, though Van Gaal has sought to prevent this predisposition almost from the outset.
"He has all the attributes to become a top football player," he continued. "However we need to give him time to adjust to his new environment and the rhythm of the Premier League."
There is little doubt that the signing of Martial will attract scrutiny over the coming months and at such a steep price tag rightly so, leaving United fans with nothing but hope that he can deliver the goods and ease the goalscoring burden currently on Wayne Rooney's shoulders.
It remains to be seen, therefore, whether United could have pulled off an excellent investment or that they've have been completely outmanoeuvred by a Monaco side all-too-used to shipping their talent for extortionate fees.