“I didn't expect to see them start the season with such flair and expression.
“I’m convinced Michael Carrick's elevation from player to first-team coach was the reason for that. I certainly didn't expect to see Shaw in their starting line-up.
Luke Shaw scored his first goal for Manchester United against Leicester (Image: GETTY)
“I remember seeing Shaw a couple of seasons ago with United at Stamford Bridge, when he looked a nervous wreck. Against Leicester the full-back was fabulous.
“It is too soon to be talking about England again - although that will change if he keeps playing like that. Good to have you back, kid.”
Shaw has struggled at Old Trafford since joining from the Saints in 2014.
He broke his leg in 2015 and then found a regular spot hard to come by under Mourinho.
And former Manchester United full-back Gary Neville believes this could be the season that Shaw fulfils his potential.
"We've seen quite a lot of these young English players - there's been quite a few at Arsenal if you think of Alex Oxlade-Chamberlain, Theo Walcott, Kieran Gibbs, Jack Wilshere and Ross Barkley is another - where the talent is there, the potential is there and it's whether they can mature and become a real player," Neville said.
Michael Carrick has joined Jose Mourinho's coaching staff at Manchester United (Image: GETTY)
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"Those questions are still being asked about Luke Shaw. I have no doubt over his talent or potential having worked with him, he's a special left-back when he's fit, on form and confident.
"However, Manchester United's a tough place to play. You've got to be there every single minute of every single day - not game - and you've got to have the right mentality.
"He came in on Friday and had a couple of difficult moments in the game, but to score the goal he did will be a big moment for him.
"From a personal point of view, having been scrutinised about his fitness and other things, you hope he can take this opportunity because Manchester United do not have a plethora of left-backs.
"I know Ashley Young is playing there but Shaw must be looking at that and thinking the space is still there to jump into. You hope that it's the start of something special for him."