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 immediately.
Former player Jay Bothroyd warned vocally the club could face danger of relegation without Howe.
Sky Sports will live broadcast the top‑flight Scottish Premiership opener on Saturday.
Dundee United face Rangers at Tannadice.
Manager Jim Goodwin firmly said he wants to make a statement there.
Dundee United coach Derek McInnes announced two United players are missing and several are questionable.
Rangers anticipate Thelo Aasgaard and Cammy Devlin to be ready for the match.