United manager Liam Fox said the 29th-minute decision changed the outcome of the game, as Hearts fought back from going a goal down to win 3-1.

United will go before the Scottish FA in an attempt to overturn his ban.

A club statement read: "Dundee United have today sent a notice of claim form to the Scottish Football Association for wrongful dismissal, relating to Ryan Edwards' sending off at Tynecastle Park."

St Johnstone striker Nicky Clark had the red card he was shown against Rangers reduced to a yellow last week.

Clark was sent off by referee Willie Collum in the 2-0 defeat but a Scottish FA judicial panel accepted Saints' claim of wrongful dismissal.

However Aberdeen failed to get Ross McCrorie's red card against St Mirren downgraded for his elbow on Charles Dunne.