Phil O'Donnell, a 35-year-old midfielder for Motherwell, fell to the ground at Fir Park and was carried off on a stretcher and taken by ambulance to a hospital. Club chairman Bill Dickie later announced the death.

"We don't know what it was but there will be a post-mortem," Dickie said. "This is a tragic happening and that's all I can say."

O'Donnell collapsed before he could be replaced by substitute Marc Fitzpatrick. He was treated on the field for about five minutes and Fitzpatrick entered in the 78th minute.

O'Donnell's nephew David Clarkson, who had scored twice for Motherwell, was substituted a few moments later because he was upset by what happened.

"I don't want to say anything more than how devastated everyone at the club is for his wife and his young children," Motherwell manager Mark McGhee said. "That's what we are all feeling tonight. Nothing else matters."

O'Donnell started his career at Motherwell before stints with Celtic and Sheffield Wednesday. He also played once for Scotland.