The Red Devils were emphatically swept aside by Arsenal in a troubling 3-0 defeat at the Emirates on Sunday and the 68-year-old was quick to criticise their style of play under Van Gaal.
He told Sky Sports News HQ: "He doesn't dominate. I like dominating football. Manchester [United] doesn't play like that.
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"It's strange that against strong teams they've got good results and with weak teams they've had difficulties. That's a strange situation.
"But the results I think are second. The game is first. Money is very important but always second. In England they play different, everybody has their own style. A mix of styles is always good.
"The most important part are the fans, that people going home are happy. It's their time off and you should give them something to enjoy."
Following an impressive run of form that saw United win four games in a row in all competitions, their title aspirations took a blow against the Gunners.
It is never an easy task to take three points from north London, but the manner of their defeat and the tactics on display will be worrying for United fans.
The decision to leave out midfield linchpin Morgan Schneiderlin - in favour of Michael Carrick and Bastian Schweinsteiger - has come in for criticism from the United faithful.
Van Gaal now has two weeks to mull over his tactics before the Red Devils take on Everton on October 16.
One thing is for sure, their midfield will have to tighten up if they are to stand any chance of challenging for the Premier League title come May 2016.
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