The 33-year-old goalkeeper was widely considered to be a potential replacement for David de Gea were he to join Real Madrid this summer.
However, Van Gaal’s comments on Valdes’ future confirm that will not be the case and he admitted he was disappointed with his attitude.
“Last year, he refused to play in the second team and there are other aspects you need as a keeper at United,” Van Gaal said in his first Seattle press conference.
“When you are not willing to follow those principles, there is only one way and that is out.
“It is a big disappointment. It is a pity because we have given him the opportunity to rehabilitate, gave him a contract and then he is fit to play.”
Van Gaal’s ruthless streak was always a characteristic of his nature and Valdes is on the receiving end of it this time.
With De Gea’s future unclear as well as Anders Lindegaard and Sam Johnstone, on top of the fact Valdes is set to leave, United’s goalkeeper situation is extremely up in the air heading in to next season at this stage.
Although United have already been very active in the transfer window, there is plenty of work left to do in order to make sure the right goalkeeper is in place by the time the Tottenham Hotspur game comes around.