The job was held by United legend Ryan Giggs but the 42-year-old announced last week he was leaving the position that he had held for two years - and indeed leaving United after 29 years at the club - to pursue his ambition to become a manager.
The former Chelsea boss held his first press conference as United manager on Tuesday and labelled his doomed 2015/16 season in charge of the Blues as a "disaster".
His side had finished sixth despite being one of the favourites for the Premier League title at the start of the season and one of the division's biggest spenders.
Jose Mourinho has revealed the tactical masterplan that saw his Manchester United side ease to victory over Ajax in last month's Europa League final.
A lot was riding on the game for the Portuguese manager.
Jose Mourinho has been reunited with Rui Faria at Old Trafford after the new Manchester United manager unveiled his backroom staff on Thursday.
Faria and Mourinho worked together at Chelsea, where the latter was sacked from in December, but the pair will now be reunited in Manchester with Faria taking up the role of assistant manager.
Faria then followed Mourinho to Chelsea that summer along with assistant manager Baltemar Brito, chief scout André Villas-Boas and goalkeeping coach Silvino Louro.
He became ubiquitous in his Chelsea tracksuit on the London side's bench.
Giggs, who made a record 963 appearances for United, had been assistant manager under Mourinho's predecessor Louis van Gaal."It is time Ryan stood on his own feet, got out there and accepted the challenge," Ferguson, the man who gave Giggs his debut, told the ."I talk about his poker face.
He has a bit of steel about him,""It is such a highly intense results industry, you need people who go into it to have a bit of steel about them, a bit of character and personality."Ferguson, who has had to watch from the sidelines as both David Moyes and van Gaal failed to build on his legacy and seen United drop away from title contention, said it was understandable Mourinho would bring his own faithful lieutenant with him."You have got to have, in your assistant, someone you have trusted all your life," said Ferguson."When I came to United, I brought Archie Knox because he was a valuable person for me. Jose Mourinho has had his assistant for years and, quite rightly, has stuck by his own man," he said."If Jose hadn't had an assistant, I know he would have taken Ryan."Ferguson, who unlike fellow United legend and director Bobby Charlton always been a fan of the volatile Mourinho, said he hoped Giggs chose his first management job wisely."I think he is ready to manage and he has a lot of quality," said Ferguson."He doesn't want to spoil that quality by going to a club where it is sacking a manager every two minutes."As for when he first saw him as a teenager Ferguson said he had no doubts Giggs would develop into a superb player."You knew right away...
Since then, the two have been inseparable, with Faria joining Porto in January 2002, Mourinho's first month in charge of his new club.