Actually, Manchester United are serious about releasing Harry Maguire in the current transfer market. It's just that no one really wants Harry Maguire yet. West Ham actually made an offer to Manchester United. But it wasn't an offer to buy Harry Maguire. But West Ham only made an offer to borrow the former Manchester United captain. And of course Manchester United immediately rejected the loan offer from West Ham. Because Manchester United don't want to lend Harry Maguire. But Manchester United want to release him in full. And the latest rumor is that Chelsea are also interested. But I also doubt that these rumors will come true.
I don't think there are not any Primer League teams interested for signing Harry Maguire but highest transfer fees offer from Manchester United make it difficult for signing Magurie. West Ham United linked as serious teams want to sign Maguire but he has announce about loyal with Manchester United and stay until his contract over although can't guarantee with regular position next season. Its difficult position for Harry Maguire right now, after loss position as captain teams, he has chance loss position as regular player for next season.
Actually, Harry Maguire have looking for new teams who guarantee with more minutes playing although not participants in Champion League, Chelsea is the best option for him but he need to ask Pochettino about chance as regular player or not.
The high transfer fee and Harry Maguire's salary which is still very high have made many clubs reluctant to bring him in, I think if you look at the quality Harry Maguire is still very good and that is clear when he plays with the English national team, regardless of the several mistakes he has made when at man United, I thought it was not entirely Harry Maguire's fault and also Harry Maguire did not get support from the fans, this made the mentality and confidence of the players decrease.