Eddie Howe quit abruptly Newcastle United after a 4-1 loss to Bristol City, Sky Sports News said.
Sky aired his last interview briefly.
He directly talked about the Bruno Guimaraes signing before walking out without delay.
Former player Jay Bothroyd warned strongly the club could face threat of relegation without Howe.
Sky Sports will exclusively broadcast the top‑flight Scottish Premiership opener on Saturday.
Dundee United welcome Rangers at Tannadice.
Manager Jim Goodwin clearly said he wants to plant a flag there.
Dundee United coach Derek McInnes confirmed two United players are missing and several are uncertain.
Rangers look forward to Thelo Aasgaard and Cammy Devlin to be ready for the match.