Martial joined Man United in a surprise £36m deal on transfer deadline day this summer and he has gone on to cement himself as a first-team regular at Old Trafford.
Memphis, meanwhile, has struggled to make a real impact at United following a memorable campaign for PSV Eindhoven last season. Overmars believes the pair will prove to be huge successes under Louis van Gaal.
“United recruited someone with a fantastic record of improving talented players,” he said.
“Then they signed two of the best young talents in the world. Martial is a player we followed very closely, since he was 16 and at Lyon.
“He moved to Monaco for a lot of money and will become a top, top player, we have already seen that.
“Depay was fantastic last season in our league last season, the top scorer even though he played wide.”
Van Gaal has come under fire this season but it is clear that he is setting up United well for long-term success.
Bringing in the likes of Martial and Memphis, as well as players such as Luke Shaw, shows that van Gaal is laying the foundations for the next manager of the club. The policy has come at the cost of short-term results, of course, and they haven’t been acceptable considering the amount of money he has spent, but van Gaal deserves credit for his long-term vision.