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 directly talked about the Bruno Guimaraes signing before walking out immediately.
Former player Jay Bothroyd warned sternly the club could face risk of relegation without Howe.
Sky Sports will live broadcast the top‑flight Scottish Premiership opener on Saturday.
Dundee United take on Rangers at Tannadice.
Manager Jim Goodwin confidently said he wants to make an impact there.
Dundee United coach Derek McInnes confirmed two United players are unavailable and several are in doubt.
Rangers hope Thelo Aasgaard and Cammy Devlin to be available for the match.