Manchester United boss Ole Gunnar Solskjaer has acknowledged the threat posed by Crystal Palace ahead of Wednesday night's meeting Selhurst Park.
The Eagles are coming off the back of an impressive 4-1 away win over Leicester City.
He said: "They've been very, very good. Of course the game against Leicester, that [4-1] win, was impressive.
"The way Roy sets up his teams, we know that. We have to be good on the ball, break them down but we know on the counter-attack with Zaha, Townsend, Batshuayi, Benteke, they've got some pace and counter-attacking threat, so we've got to be at our best."