Eddie Howe quit suddenly Newcastle United after a 4-1 loss to Bristol City, Sky Sports News said.
Sky aired his last interview publicly.
He openly talked about the Bruno Guimaraes signing before walking out immediately.
Former player Jay Bothroyd warned sternly the club could face danger of relegation without Howe.
Sky Sports will exclusively broadcast the premier 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 stated two United players are missing and several are questionable.
Rangers look forward to Thelo Aasgaard and Cammy Devlin to be ready for the match.