McGarry also says Maddison’s representatives want a release clause inserted into his new contract.
United’s defence has received huge criticism already this season despite the club playing just three Premier League games.
The 24-year-old has a queue of clubs lining up for his signature but reportedly favours a move to Old Trafford.
Everything hinges on Paul Pogba’s future, with the World Cup winner likely to depart at the end of the season.
And according to Falk, they are still yet to make a move, despite Sancho pushing for the deal to happen.
He has taken the Premier League by storm, chipping in with 13 goals and 10 assists for the Foxes, earning him a place in Gareth Southgate’s England set-up.
Ole Gunnar Solskjaer was eager to bring Maddison to Old Trafford in the summer transfer window after realising a run at his signature last month was a non-starter due to Leicester’s position in the Premier League table.
The arrival of Bruno Fernandes from Sporting Lisbon last month strengthened Solskjaer’s options in the engine room.
Wright has compared the two Englishman, saying there is not much between them in terms of ability.
One of Grealish’s six league goals this season came at Old Trafford when he fired in a stunning strike as Villa came away with a point in December.
Wright says the 24-year-old was the best player on show that day and United would have taken note of his performance ahead of a potential transfer move in the future.
McGarry says Leicester and Maddison have been locked in talks over extending his stay at the Foxes since November.
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