Jean-Philippe Mateta, the Crystal Palace forward, was stretchered from the Selhurst Park pitch after being caught in the face by a head-high challenge from Millwall goalkeeper Liam Roberts who was sent off for the foul.
Mateta appeared unconscious and received treatment for more than eight minutes before being taken to a waiting ambulance.
The Palace forward was the target of chants of “let him die” from some of the 2,800 visiting supporters that could be clearly heard on television, and BBC commentator Jonathan Pearce said: “Millwall fans are not endearing themselves to anyone with their chanting about Mateta. The football club could be revisited about that.”
The incident happened in the sixth minute of the FA Cup fifth-round tie as Mateta ran on to a long ball and Roberts raced out of his penalty area. The goalkeeper attempted to clear the bouncing ball and was off the ground when studs struck Mateta.
Roberts was dismissed after referee Michael Oliver reviewed the incident on a pitchside monitor.
