The 21-year-old will now be a permanent member of United's first-team squad having been at the club since 2011.
Following the arrival of N'Golo Kante last season, Matic held discussions with Chelsea regarding his status at the club.
Matic made his debut appearance for the Red Devils last night, in which he played for 45 minutes, following his £40m move earlier this week. And all three shone at the Aviva.
This is where the signing of Nemanja Matic comes in. It was nice to play in front of our supporters - I think there was a full stadium of Manchester supporters. Try telling that to Man United's Andreas Pereira.
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He can fight for the ball and his visionary attacking play in tandem with Antonio Valencia presents a potent threat. There are huge hopes for what his inclusion could mean for Paul Pogba too.
In the end, Pogba is a player that makes a huge impact on the game. He has claimed Europes biggest prize on two separate occasions, neither with one of the games "elite", as he led Porto and Inter Milan to European glory. After spending four years with the Turin club, he returned to United for a world record fee of £89.3m last summer. "The Premier League is the same so let's give him time but I'm happy with what he's doing step-by-step".
Could Matic really have been a passenger every week in a team that dominated the league from nearly the very beginning of the season and then went on to be named champions?
Here, in the gallery above, Press Association Sport lists all 20 clubs by the average height of their first-team squad in centimetres.
It may not be totally enjoyable though until José addresses his team's defensive frailties.
Mourinho remains convinced that he can help to push United back to the summit once more, but concedes that the task is more hard than it once was.