#2 Paul Pogba
Technically, the Frenchman is both a Sir Alex as well as a Mourinho signing and he had already stirred up a huge controversy when he was just a teenager. The Premier League giants had been embroiled in a huge battle with French side Le Harve, who claimed to have him under contract. FIFA had to intervene to clear Manchester United of any wrongdoing when they signed a young Paul Pogba. Sir Alex himself had openly defended his club during the tussle.
However, Pogba would go on to join Juventus after failing to break into the team in his three seasons at Old Trafford. He returned after Mourinho took over, becoming the costliest footballer in the world at that moment, costing United a then-world record £89m!
Since then, the Frenchman had endured a mixed life at United under the Portuguese. He had looked world class at times, while appearing average on other occasions and had not fully justified his price tag
But post Solskjaer's arrival, Pogba has been massive for United and has been one of their best players in the last month, if not the best in the division. Whether Sir Alex deserves credit for all that might be debatable, but it was the Legendary Scot who brought him to Old Trafford in the first place.