Shaw, 19, spent much of a training session on Monday night away from his team-mates at Washington’s FedEx Field as he undertook dedicated sessions with fitness coach Tony Strudwick.
Having arrived as the most expensive teenager in British history, cutting short a post-World Cup holiday to start pre-season training with United, Shaw has now been told he must step up his efforts in training if he is to impress his new manager.
“Shaw is okay, but I am always a trainer-coach who sees individuals and what they need,” Van Gaal said. "He needs to be fit and is not very fit or fit enough to do what I want.
“He needs to train individually until he is fit. I cannot judge how long that will take, but I see what I see.
“I have spoken with him and we have made a programme for him. He agreed with me.
Manchester United's new signing Luke Shaw speaks during a press conference ahead of a training session at the Rose …
“How long (will he be on the programme)? That we have to see, but that I don’t know. I have heard good messages from Strud (Tony Strudwick), but we have to see.”
Van Gaal also revealed Wilfried Zaha will make his first appearance under the Dutchman against Inter Milan on Tuesday night but the winger will have to adapt to a new position.
“Zaha shall play in the second-half in the strikers’ position,” Van Gaal said. “When we play this system, he has to play as a striker, otherwise he cannot play.
“Ashley Young is a winger, but he is another type who can play wing-back and he did very well against Roma.
“He can play left and right side, but we shall see.”
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