After a trophy-laden career with Porto, Chelsea, Inter Milan and Real Madrid, Mourinho is set to replace Dutchman Louis van Gaal, who was sacked on Monday, with a remit to bring back the glory days the club once took for granted under Alex Ferguson.
The 53-year-old, sacked by Chelsea in December seven months after winning his third Premier League title at the London club over two spells, had been constantly linked with the United job as Van Gaal struggled to make an impression at Old Trafford.
The Dutchman was dismissed two days after steering United to their first FA Cup success in 12 years when they beat Crystal Palace 2-1 after extra-time in Saturday’s Wembley final.
Van Gaal’s preferred possession-dominated playing style at a club more readily associated with fast, direct attacking, was widely criticised, and it appeared to take his players time to adapt.
Mourinho is also known for pragmatism, however, relying on a strong defensive foundation and hard-working midfielders and strikers.
He has a history of success wherever he has managed and a proven track record in the English game.
Mourinho won the UEFA Cup and Champions League as well as the domestic double twice in his two seasons at Porto and led Chelsea to their first top-flight title in 50 years in his first campaign, retaining it the following season.
He also won the League Cup and FA Cup before moving to Inter where he won Serie A as well as the Champions League and Italian Cup.
Mourinho helped Real to their first La Liga crown in four years and on returning to Chelsea, he again won the Premier League before an unexpectedly poor — and troubled — start to the 2015-16 season led to his sacking.