Eddie Howe quit abruptly Newcastle United after a 4-1 loss to Bristol City, Sky Sports News said.
Sky aired his last interview publicly.
He openly talked about the Bruno Guimaraes signing before walking out without delay.
Former player Jay Bothroyd warned strongly the club could face danger of relegation without Howe.
Sky Sports will nationwide broadcast the national Scottish Premiership opener on Saturday.
Dundee United face Rangers at Tannadice.
Manager Jim Goodwin firmly said he wants to plant a flag there.
Dundee United coach Derek McInnes announced two United players are absent and several are in doubt.
Rangers hope Thelo Aasgaard and Cammy Devlin to be ready for the match.