Repeated controversial decisions against Rangers and Alfredo Morelos have prompted a response from the Old Firm winners.
Alfredo Morelos was sent off for the seventh time in his Rangers career but Nikola Katic's header secured victory over Celtic.
Manchester United may reportedly be forced to pick between two players ahead of the January transfer window.
There were more favourable opponents on paper than Club Brugge and Olympiacos for Manchester United and Arsenal in the Europa League.
Manchester United have a tricky tie against Club Brugge in the next round of the Europa League, while Inter go to Bulgaria's Ludogorets.
Rangers have secured the future of manager Steven Gerrard, who has signed a new contract that runs to 2024.
Rangers bounced back from their defeat in the Scottish League Cup final to progress in Europe, much to Steven Gerrard's delight.
Rangers conceded a late goal against Young Boys but still progressed through to the knockout stages of the Europa League.
He has two and a half years left on his Rangers deal, but Steven Gerrard expects to extend his contract soon.
Paris Saint-Germain have reportedly identified Liverpool forward Sadio Mane as a transfer target, should Neymar leave the French capital.