The Hoops were beat in heartbreaking fashion but refereeing calls have been put under the microscope.
It ended with a major gut-punch and Celtic have been left licking their wounds from more Champions League pain.
VAR has been put under a global microscope this week after the farce south of the border around Luis Diaz's wrongly disallowed goal during Liverpool's defeat to Tottenham. It means even more scrutiny than usual upon whistlers and match official Donatas Rumsas was a man drawing some ire for decisions made in Celtic's gutting loss. Record Sport takes a look at four of them that occurred in Glasgow's East End.
IFAB's violent conduct description makes for interesting reading. It explains: "Violent conduct is when a player uses or attempts to use excessive force or brutality against an opponent when not challenging for the ball, or against a team-mate, team official, match official, spectator or any other person, regardless of whether contact is made.
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