The 27-year-old completed his £44million deal to the French champions after struggling at Old Trafford in the second half of last season.
Di Maria has come in for criticism for not living up to his hefty price tag in the Premier League and his now former boss gave a possible explanation as to why he failed to adapt.
Van Gaal said: "There was only one solution in the story of Di Maria. Why has he not been successful?
"That you never know but it's hard to find players who can deal with the whole package that is required here.
GETTY
Angel Di Maria struggled at United after a promising start
"So, the breakneck pace of the English matches in conjunction with the British living culture which is different from the culture in Latin countries."
Di Maria missed PSG's opening game of the Ligue 1 season on Friday due to match fitness while United started their Premier League campaign with a 1-0 win over Spurs yesterday.
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