talkSPORT understands that Man United have lodged a take it or leave it offer for the England international.
Should the deal materialise, the fee would make Maguire the most expensive defender in world football, surpassing the £75m Liverpool paid for Virgil van Dijk in 2018.
And Johnson, who won the Premier League, FA Cup and League Cup during a 16-year career, senses the transfer will get completed before the 5pm deadline on August 8.
“If United have come calling again they know Maguire wants to go,” Johnson told Jim White on talkSPORT.
“As long as Maguire gets that message through to Leicester then I’m sure that deal will happen.
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