The Reds, despite unflinching support from the home crowd, were unable to respond to Renan Lodi's first-half header and bowed out of the Champions League at the round-of-16 stage.
Diego Simeone's men produced a masterclass in seeing out time in the second half after their controversial goal came seconds after Anthony Elanga appeared to be fouled when embarking on a dynamic run down the right wing.
Here's what Ralf had to say in his post-match interviews with club media and BT Sport...
OVERALL ANALYSIS
"We started the game exactly the way that we wanted to play it, energetically.