Manchester United boss Louis van Gaal has suggested that West Ham United midfielder Dimitri Payet took a dive in the 1-1 FA Cup draw on Sunday.
The 28-year-old was already on a yellow card when he went down in the United area under a challenge from Marcos Rojo.
However, referee Martin Atkinson waved the play on and minutes later, Payet scored a brilliant free-kick to give the Hammers a 1-0 lead.
Van Gaal said: "Payet was more or less diving. He was maybe touched, but not enough to fall like that.
"But there are always discussions about the decisions of the referee."