The Hammers were denied a point when Mark Noble's stoppage-time penalty was saved by David De Gea.
"I think it was [a cruel result]," the 24-year-old told the club's website after the 2-1 defeat. "The work rate was there and we played some good stuff up against an unbelievable team.
"To concede in the last minute is always a kick in the teeth, but I think we can take a lot of positives from the game today.
"I think that [our hard work] is a given, especially the way the manager is and the way the manager works. Hard work and work rate is always going to be there from us, and like I said we played some good football today against a top side.
"We knew we were going to be without the ball for a while with the football that they play, but we dug in, had chances ourselves, and a last-minute winner for them is always hard to take. There were lots of positive for sure."
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