He was always willing. Remember that he never complained when he was rotated with rashford as he felt it was a fair and healthy competition. But when Sanchez came, he was in a purple patch, but shunted to the right and eventually dropped. Then, no matter how well he played, Sanchez was always going to start above him, and even rashford at one point, making him 3rd choice.
Under such unfair pressure, you can hardly fault him for sulking or his agent coming out with comments. Let's just hope Jose is not looking to drop him again as soon as he gets a chance.