The Spaniard was left out of the squad which travelled to the United States for United’s pre-season tour, but had tweeted earlier in the week that he was “working hard” for the new season, finishing the message with: “Come on you Reds”.
“He is not selected because he doesn’t follow our philosophy and there is no place for that one player,” Van Gaal said.
“Philosophy is how you play football and how you maintain your match rhythm. For example, he refused last year to play in the second team.
However, in a press conference on Wednesday night, Van Gaal made it clear Valdes had no future at Old Trafford, claiming the 33-year-old had refused to line-up for the reserve team.