A Kyle Walker own goal handed Louis Van Gaal's side the win, but there were positives for Pochettino's side.
Mauricio Pochettino’s side were more than equal to Louis Van Gaal’s side in the opening stages of the game, with Christian Eriksen unlucky not to give his side the lead with a smart lob.
However, an unfortunate Kyle Walker own goal on 22 minutes changed the tide of the game, with Spurs unable to fight their way back into it, although Eriksen did force keeper’ Sergio Romero into two late saves.
And Dier says the defeat was hard to take for the entire side.
“The goalkeeper made some good saves and it was disappointing for us but we gave it a good go,” he told tottenhamhotspur.com.
“Old Trafford is a hard place to go and win. There are lots of positives for us to take but if you don’t get any reward it’s difficult to look on the bright side.”
Positives for Pochettino
While the loss is a hard one to take for Spurs, there were positives to be taken from their performance.
The intensity with which they started the game was impressive to say the least, and had Eriksen taken the early chance then things may have turned out differently on the day.
Most pleasing though was the defensive partnership of Jan Vertonghen and summer recruit Toby Alderweireld.
Given the side’s defensive weaknesses last season, the bond being built between the duo will have been encouraging for Mauricio Pochettino looking forward.