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Donny Van de Beek reckons United's performance was “not good enough'' following the team's 3-1 surprise loss to Crystal.
The Old Trafford debutant scored his side's only goal in his first Premier League game for the Red Devils.
The former Ajax came off the bench to net for United in the 67th minute.
Van de Beek told MUTV: “‘That was not good enough today. Last week in training, it looked really good.
“There was lots of quality and we played fast but today we played too slowly.”