The 22-year-old was hooked off at half time during Man United’s 2-0 win over Brighton and Hove Albion last weekend, with the manager later hitting out at his left-back for failing to deliver an adequate defensive performance.
It has been claimed by the Telegraph that United players were shocked by Mourinho’s treatment of Shaw, who has now resolved to leave in the summer after growing frustrated with a lack of game time and respect from his manager.
And Barton, speaking on talkSPORT, noted that Shaw’s time under the 55-year-old has significantly hampered his confidence.
“You can ruin a young boy’s career, he was a promising young talent. He wasn’t a Mourinho signing was he, he’s given him game time but Shaw is clearly devoid of confidence and is not reaching his potential either due to injuries and a lack of belief from those around him.
“Look, at Man United if you don’t perform at the highest level when you’re given the opportunity, they generally go out and buy the best available. That’s what they’ve historically done and I expect them to do the same again.
“I still think Luke Shaw would be a good player wherever he goes, but there will be a psychological rebuilding process for him.
“There’s no way you can go through what he’s going through now at Man United and not come out a little bit mixed up.”
You can hardly blame Shaw for growing exasperated with Mourinho. The Portuguese, just two months ago, hailed him as one of the best left-backs in the world, but has since only handed him three starts.
The most recent came following a month on the sidelines, plunged into a beleaguered lineup still reeling from the trauma of Sevilla, and while his performance felt rusty he was hardly an outlier – an obvious weak spot in the United side.
Regardless, Mourinho was not happy, and Shaw had to pay – which tells you plenty about the strained nature of their relationship at Old Trafford.