"Today the players showed their quality - we saw some really lovely goals today".
"I said it before he was Real Madrid coach and I'll say it again now that he's gone". We came into the game fully focused and it showed.
Plzen are now unable to finish in the top two spots, leaving just CSKA Moscow - five points worse off - in pursuit of Madrid and Roma with two games to go. CSKA are third with four points, while Plzen sit at the bottom and are out of contention to progress.
It was a landmark night for Benzema, whose first goal was his 200th for the club.
Casemiro doubled the lead three minutes later when the Brazilian outjumped his marker and headed home from a corner.
Casemiro guided a simple second into the corner of the net after being left totally unmarked from a corner, before Benzema helped himself to another in nearly identical circumstances, this time once picked out by Gareth Bale's headed pass four yards out.
Madrid were dominate throughout and Toni Kroos added an impressive fifth after the interval when he chipped goalkeeper from inside the area.
That was most evident for Casemiro's header, and the midfielder said: "It was an important night for us".
"He is a great coach, we now have more confidence and we are going to compete".
"On other days we created chances like tonight but didn't take them".
In fact, the 5-0 win for Madrid over Plzen is the biggest ever by a Spanish side away to a Czech team in European competition.
"We conceded four goals in the first half and the match was over", Plzen defender Lukas Hejda said.
The Los Blancos side now have interim boss Santiago Solari in charge and appear to have revived their spirits, ending their win-less run in their 2-0 victory over Real Valladolid last weekend.
Live stream: You can watch the match live via FuboTV. Once they play with this seriousness, commitment and wanting to score.