It was reported that the visitor's coach was hit with rocks and other projectiles, with a video showing the bus had sustained a broken window. The Reds were quick to label the behavior as "totally unacceptable" in a statement released shortly before kick-off at Anfield.
“We condemn unequivocally the actions that led to Real Madrid’s team bus being damaged during its arrival to Anfield this evening," they said. "It is totally unacceptable and shameful behaviour of a few individuals."
“We sincerely apologise to our visitors for any distress caused." the statement added. "We will work together with Merseyside Police to establish the facts and identify those responsible.”
Real Madrid appeared to have accepted Liverpool's apology, with their director of institutional relations Emilio Butraguenp saying: "The relationship between the two clubs is great. Liverpool's directors have apologised and now we focus on the match."
Jurgen Klopp's men came into the game on the back of a 3-1 one loss in Spain and needed to win by at least a two-goal margin to book their place in the semi-finals. But a goalless draw on the night saw the LaLiga giants go through 3-1 on aggregate.
This isn't the first time an opposition bus has been damaged in the build-up to a match at Anfield. Three years ago Manchester City’s bus was hit by bottles and flares on the way to another Champions League last-eight clash. On that occasion, UEFA fined Liverpool €20,000 for the damage as well as €6,000 after fireworks were set off and objects thrown outside the ground.