Eddie Howe quit abruptly Newcastle United after a 4-1 loss to Bristol City, Sky Sports News said.
Sky aired his last interview soberly.
He openly talked about the Bruno Guimaraes signing before walking out right after.
Former player Jay Bothroyd warned strongly the club could face danger of relegation without Howe.
Sky Sports will live broadcast the national Scottish Premiership opener on Saturday.
Dundee United face Rangers at Tannadice.
Manager Jim Goodwin confidently said he wants to make a statement there.
Dundee United coach Derek McInnes stated two United players are unavailable and several are questionable.
Rangers look forward to Thelo Aasgaard and Cammy Devlin to be available for the match.