Huddersfield Town player Tommy Smith has been air lifted to hospital after being seriously injured in the final minutes of the Terriers' 2-1 defeat to Leeds United.
Smith, 22, was treated on the pitch by first aiders for around eight minutes and was then carried off on a stretcher.
Crowds were then quickly cleared from a section of the John Smith's Stadium to allow Yorkshire Air Ambulance to land on the pitch.
The club has since confirmed Smith has been flown to Leeds General Infirmary with suspected head injuries.
After the match, Town manager Chris Powell said: “The Yorkshire Air Ambulance has landed on the pitch. They stabilised Tommy, but he was in and out of consciousness for at least 10 minutes.
“He’s in good hands. They’re taking him to Leeds General Infirmary and hopefully he will be back fighting-fit soon.
“I can’t confirm exactly what happened. We’re trying to establish exactly how he took the knock – whether it was Billy Sharp or our goalkeeper. It definitely wasn’t the post. We’re not 100% sure as the replay is quite inconclusive.
“In the end it doesn’t matter now; we’re just worried about his welfare. I’m a bit in shock seeing it all. I made sure I saw him and his family. Hopefully everything will be ok.”