#2 Balance
One of the key aspects of a title-winning side is the balance between defence and attack. No matter the attacking nature of the side, it is imperative to have defensive stability.
Leicester City's brilliant Premier League win in 2016 was built on a rock-solid defence of Wes Morgan and Robert Huth while a master destroyer in N'Golo Kante sat in front of them. It was no surprise as Kante's switch to Chelsea played a pivotal role in the London club's title win last season.
Thus, an assortment of attacking riches that combine pace and power needs to be balanced with a stable defence. Manchester United's signing of Lindelof and Matic stabilizes the defensive side massively. Matic, in particular, is a skilled player who can pass the ball along with having strong defensive attributes.
Also Read: Nemanja Matic: Missing piece of the Manchester United jigsaw?
The presence of Eric Bailly, Antonio Valencia and David De Gea provides a great base for the likes of Lukaku, Marcus Rashford, Henrikh Mkhitaryan, Anthony Martial and Paul Pogba to attack up front.
Lukaku, Rashford and Martial are top goalscorers while the remaining players can both create and score as well. Thus, United have the requisite balance to win matches on a trot and this bodes well for Mourinho to deliver the league title.