Watford boss Walter Mazzarri said Saturday's loss to Manchester United was a "pity after a strong start at Old Trafford.
Anthony Martial impressed on his return to the United starting lineup, scoring one and providing the other as Jose Mourinho's men comfortably ran out winners.
But Mazzarri was left frustrated by aspects of his side's display, bemoaning wasteful play in midfield.
"They are a very good team, for sure," the Italian said through an interpreter. "We have seen it today and also they had a great condition.
"It is a pity because we started very well.