The Portuguese boss questioned their commitment to the club after they pulled out of the trip to face Swansea City at Liberty Stadium.
Shaw only returned to action during pre-season after making a full recovery from the horrific broken leg injury that he sustained over a year ago.
Speaking about Mourinho’s methods, Keown claims he shouldn’t be making players feel like he doesn’t trust them.
“At some point in their career, every player will have had a level of pain or discomfort that they’ve got to try to manage,” he wrote.
“I remember Jurgen Klopp saying last year that Daniel Sturridge needs to have a better judgement of what is a serious injury and what is run-of-the-mill stiffness.
“I played with tendinitis in my knee, discomfort in my back – these are things that can be managed and that you can play with.
“You have to trust your players to manage their own bodies. If you don’t allow the player to make that decision then you lose trust.
“If a manager had fronted me up publicly, I’d be knocking on his door and saying, ‘How dare you question me in public’. I’ve judged that I can’t play with that injury.”
Mourinho shouldn’t have put Shaw in the spotlight after his performance against Watford and then again after the Swansea victory, even though he didn’t even play.
As for Smalling, Daily Mail claim he has been ruled out for a month with a broken toe which is a big blow for Mourinho’s side.
They are both crucial players for United and hopes are we can see them back in action soon.