Chelsea is going to hire a player like Maguire because of his huge personal mistakes and I think a player like Maguire is not really interesting for any team to spend huge money for him and 40m is a lot for this player, Chelsea had expensive players before and they didn't get food results that's why I think Chelsea can find a better player instead of Maguire.
It is still a rumor, we don't know how serious Chelsea to sign Maguire. I even think Chelsea current defenders are better than Maguire. Even if they are not strong enough but they don't score own goals at least. 
Maguire has had enough and I think players do have a second chance to prove their worth, there could be some transition if he comes Chelsea to play because been a Captain in Manchester United is a big headache he has to . deal with every week and hence the reason why he is always confused in the field that got him playing own goals most of tbe time but who knows Chelsea will be a revival journey to Maguire to redeem his career, he has come far to become bench in Manchester United, there are other teams that would use him even if there is no Captain tag on his hand.
Quote
Harry Maguire is 30 years old, his market value is €20m. No team will spend €40m for Maguire, it is just nonsense to buy a player who has bad performance and he is no longer young defender. Moreover, €40m is overpriced since he is only valued €20m. I assume any club who is interested to sign him for below €10m.
What about player that had good performing year in their previous clubs but becomes worst when they change their club, we have seen it in the premier league many times and the team just get worse with the hype players, having Maguire will give the team less expectations from him and I believe he will want to step up his ways to impress any club that sign him.