Scholes believes that the sometimes maligned Shaw has the capability to be one of the best left-backs in Europe but he has to want it.
"As a left-back he can become anything he wants but it has to come from him," Scholes told BT Sport. "It's in his own head.
"He just hasn't stayed fit enough for long enough. If he wants to be one of the best left-backs in Europe he can be.
"He's strong and he's quick. He has a nice left foot. As a full-back you have to be one of the fittest on the field.
"He has proven recently that he hasn't got the engine to do that. He's not quite had the dedication to that role.
"If he had the dedication, I think he would be a top left-back."