The Dutchman has been outstanding since arriving from Arsenal.
"It's such an exciting challenge when a player like Robin arrives," Meulensteen told manutd.com.
"Our first job was to help make sure he settled in quickly. It was an advantage to us that we knew what sort of player he was. The biggest challenge for us was to, as quickly as possible, create an environment whereby Robin understood what the club is about, what the training is about and what the expectations are. It could not have gone any better - he's been absolutely brilliant, and hopefully that will continue for the next two months and beyond."