The full-back looked like he was on his way out with his contract up this summer having been largely ignored by manager Jose Mourinho since he took charge of the Red Devils, but the young left-back has turned it around.
Mourinho believes Shaw has made a big effort to convince him he can fit in with his methods and has praised the defender for his effort. The Manchester United boss has confirmed he will be rewarded with a new deal.
Mourinho said: "I know Shaw since he arrived in the Premier League with Southampton and know his potential and quality. Could he come in my direction? The way I like my players to be not just on the pitch but during the training week? And he made a big effort.
"He's been free of minor injuries for a few months which sometimes stops the evolution and I'm really happy. The natural consequence of it is that he will have his contract and he will be a United player for years."
During the later stage of the last year, Man United activated a one year-option on the £80,000-a-week deal Shaw signed when he arrived in a £27million deal from Southampton.
That meant he still has a further 18 months left to run on his current terms, but Mourinho has now instructed the club to tie the former Southampton star down for long-term.
This indeed is a remarkable turnaround by the 22-year-old. It is not at all easy to change the mind of a manager like Mourinho who is known for his stubborn attitude. At the same time, this should end the Red Devils' long-term pursuit for a new left back.