Luke Shaw's first senior goal proved decisive for Man United in the opening match of the Premier League season, as they held on to beat Leicester.
After a week of full training, Maguire and Vardy are in Puel's thoughts, but the Frenchman confirmed on Thursday morning that a decision would be made following City's afternoon session.
"It has been a hard pre-season with all the worldwide players coming back step-by-step and without the good levels and freshness necessary to play 90 minutes".
"We know a friendly game is always different".
"The World Cup helped [He played in all three of Nigeria's games in Russian Federation, starting twice] - we didn't get to go through but it was a good experience and good fitness".
He said: "I was happy with the progress of Harry in the second half of last season".
'I am happy to keep Harry.
"I scored against United in the derby so it was a good experience and I am looking forward to hopefully doing it again". He is our best player.
It is believed that Leicester now value Maguire at £75 million, a fee that United board were (understandably) unwilling to meet. It is not serious'.
Leicester are in advanced talks to sign two centre-backs - Filip Benkovic from Dinamo Zagreb and Caglar Soyuncu from Freiburg - at a combined cost of about £35m.
That makes it seven summer signings at Leicester - following Ricardo Pereira, Jonny Evans, James Maddison, Danny Ward and Rachid Ghezzal.
"Harry Maguire did great at the World Cup, but of the players potentially available he would not be my first choice", Ferdinand told The Mirror."I would go for Alderweireld, all day long, because he is suited to the way United play".