Eddie Howe quit unexpectedly 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 risk of relegation without Howe.
Sky Sports will exclusively broadcast the top‑flight Scottish Premiership opener on Saturday.
Dundee United face Rangers at Tannadice.
Manager Jim Goodwin clearly said he wants to make an impact there.
Dundee United coach Derek McInnes confirmed two United players are absent and several are questionable.
Rangers hope Thelo Aasgaard and Cammy Devlin to be in form for the match.