While there is every reason to be excited about the 'Godfather of German coaches' being at Old Trafford, fans mustn't forget to reel in their expectations.
Failure to win a trophy and patchy form got Ole Gunnar Solskjaer sacked. Tribuna.com takes a look at a few reasons why Rangnick wouldn't miraculously turn things around:
Intensity might not be good news
Rangnick's teams are built on pressing and he just loves it.
Like he says, you either press or you don't. And his teams almost always press hard. That's one of the reasons why the German is known to prefer working with younger players. For example, he reduced the average age of his RB Leipzig team to 24 from 29.
The current United squad is not exactly what you'd consider a 'young squad'. Rangnick doesn't just demand intensity on the field but in training as well.
From the picture below, it's evident that Fred is perhaps the only player who presses the opposition and he does it well.
How United stars fare at pressing in 2021/22:
At Liverpool, most of their players are good pressers, with the full team averaging around 18 presses per 90 minutes. Both Tuchel and Jurgen Klopp have been influenced by Rangnick's philosophy.
United have Jesse Lingard who presses well but he could leave in January while Daniel James is no longer part of the club. Adapting to high-intensity performances and training could potentially lead to multiple injury concerns for the Red Devils.
Of course, the players could cope and rise to the standards but operating at such high levels on a consistent basis could cause more wear and tear.
First time managing top team
Rangnick hasn't ever managed a top side. In fact, this is the first time he will be in charge of a European giant.
That's not all - Rangnick last managed RB Leipzig in 2018/19 and hasn't been coaching since then.
While there's no denying his abilities, it's important to remember that we need to give him time to steady the ship. Not to mention, it's his first stint in the Premier League.
Temperamental side could flare up
Prior to joining Lokomotiv Moscow as the Head of Sports and Development, Rangnick almost joined AC Milan.
However, because of issues with the board, he unceremoniously opted against taking charge of the Italian side.
He's known to have a quick temper which is totally unlike what we've seen from Solskjaer so far. While the Norwegian was never spotted without a smile, Rangnick is not so easy-going.
The Glazers and the United board have their own set of problems and it'll be interesting to see how the 63-year-old fits the current dynamic at the club.
Being a tactical god is not enough
Rangnick's tactics, pressing and contribution to the gegenpressing style of play has made him a 'tactical God' almost.
Again, we need to remember that having good tactical knowledge isn't enough. For starters, Marcelo Bielsa is widely considered a tactical genius but when was the last time he won a big trophy?
He's done well to stabilise Leeds United in the Premier League but let's not forget they were beaten by Solskjaer's side miserably last season.
Hasn't won major honours yet
Unlike the likes of Pep Guardiola, Jurgen Klopp or even Zinedine Zidane, Rangnick hasn't stamped his mark in Europe so far.
He hasn't won the Champions League even once, although he has a decent trophy haul thus far.
The German might not be able to win trophies immediately or even guide us back to the top four. These things take time and we need to give him that till the end of the season at least.
That said, it's worth remembering that Rangnick could prove all of us wrong and we're here to cheer him on if that happens. If not, we still cheer him and hope for better things after a permanent manager takes charge next summer.