The start of Saturday's match in Paris was delayed after Reds supporters were unable to get into the Stade de France - and what quickly became clear was the shocking way they had been treated.
Proceedings eventually got under way 36 minutes after the scheduled kick-off time with Madrid goalkeeper Courtois producing an imperious performance to keep Jurgen Klopp's side at bay.
And on Sunday morning, Courtois took to Twitter to send a message to the Liverpool fans.
He said: "I feel sorry for Liverpool fans and the way they were treated. I hope everyone got home safe!"