The 35-year-old collapsed while being substituted towards the end of Motherwell’s 5-3 Scottish Premier League win against Dundee United on Saturday and later died in hospital.

Robert Liddle, Motherwell’s club doctor, said on Tuesday: “The post-mortem revealed that Phil had suffered left ventricular failure of the heart.”

O’Donnell’s funeral will take place at St Mary’s Church in the western Scottish town of Hamilton, near Motherwell on Friday.

His death caused widespread grief within Scottish football and beyond and O’Donnell’s wife Eileen, speaking on Tuesday for the first time since her husband’s passing, said she’d been ”overwhelmed” by messages of support.

Mrs O’Donnell, who on Monday visited a makeshift shrine of scarves and photographs at Motherwell’s Fir Park ground, said: “Although he achieved so much in football the most important thing for him was his family.

“He would like to be remembered as a family man and we were all so proud of him,” she added. “We hope we will now be given peace and time to grieve but we are overwhelmed by the messages of support we have received.”