However, the Foxes managed to keep hold of Maguire, setting an asking price of around £75million, and the Red Devils were not prepared to meet their rivals' valuation of the centre-back.
While names like Jerome Boateng, Harry Maguire and Yerry Mina have all been linked with a move to Old Trafford, it has been clear since last season that Mourinho's preference would be Toby Alderweireld.
Asked about United's interest, Leicester boss Puel joked with the media at his pre-match press conference on Thursday. However, it's reported today that they could have signed him last summer for just £15m.More news: Trump touts record with minorities after Omarosa criticism, ahead of Charlottesville anniversary
'For Harry it's new.
"We have to prepare this season with good possibility". He showed his quality with the national team.
James Maddison should shake off a knock to make his debut alongside other new signings Ricardo Pereira and Rachid Ghezzal, whilst England World Cup men Harry Maguire and Jamie Vardy should feature.
Both players were in action on Friday night as Leicester opened their season with a 2-1 defeat to United at Old Trafford, and Chilwell also paid tribute to his teammate's performance.More news: David Moyes: 'Manchester United will be top in November'
"When he came back after the World Cup he could maybe feel nearly cocky".
'He could have been but he's not.
Oh dear Jose, at least you can get your smile back tomorrow against Leicester.
'The progress of different players is different.More news: English Premier League Report: Liverpool v West Ham United 12 August 2018
It is understood Maguire has been hoping United would come in with an offer for him before the window closed, though Puel has outlined how Leicester can not lose any more top players. "We are all happy that he has stayed".