Ronny Deila 's Celtic side won their 15th Scottish Cup quarter as Kris Commons and James Forrest scored . Dundee United captain Sean Dillon sent off after the break for a late challenge on Celtic defender Emilio Izaguirre . Celtic are leading the Scottish Premiership and have a Scottish League Cup-final replay with Dundee United .
Ronny Deila 's Celtic side won their 15th Scottish League Cup as Kris Commons and James Forrest scored . Dundee United captain Sean Dillon sent off after the break for a late challenge on Celtic defender Emilio Izaguirre . Celtic are leading the Scottish Premiership and have a Scottish Cup quarter-final replay with Dundee United .