According to Goal's Insider, Van Gaal has placed the Argentine on a special muscle-gaining regime aimed at making him more physical.
And the United coach is worried that it's his size that is holding him back and preventing him from making an impact in the Premier League.
The Argentina international was an integral part of Real Madrid's Decima triumph before making the record-breaking £59.7million move to Manchester.
But since joining he has looked a shadow of his former self, culminating in him being dropped and replaced by Juan Mata.
However, LVG will hope this new regime, similar to the one that Mesut Ozil was placed on at Arsenal, will work wonders and see him start repaying his record transfer fee.
GETTY
Angel Di Maria has been placed on an intensive physical regime
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