A Maguire transfer from Manchester United to Chelsea would be a surprise for several reasons. Maguire had a hard time in Manchester and I think besides the financial aspects he could also be a winner if Chelsea performs well and he can play a part in that success. But if Chelsea fails again, I can already read all the public allegations against the club and those responsible for the transfers because why would they sign players that underperformed when they themselves underperformed and are now trying to recover? Negative times negative is positive? Maguire is a high risk transfer if this really happens as Chelsea doesn't have the time to run some experiments with players who failed elsewhere.
Maguire does not belong to top defenders and he was over estimated since his transfer from Leicester City to Manchester United. If Chelsea buy him and consider him as an average central defender, it is acceptable for their transfer decision.
I only wonder that does Chelsea actually need such an average central defender to improve their defense quality? Logically they don't need Maguire and they can find better players who have cheaper transfer price and even are younger than Maguire.
Personally I don't see chance for Maguire to move to Chelsea in this summer. He must find average clubs, not top ones like Chelsea.