Lopetegui is rumoured to be on the brink of the sack at the Santiago Bernabeu after a dismal run in all competitions, but there was a timely victory for the reigning Champions League holder on Tuesday, albeit in unconvincing fashion.

While Plzen largely gave as good as they got, the recalled Benzema crucially broke the deadlock, scoring in a 14th consecutive Champions League season with a powerful early header.

A second from Marcelo followed, yet Patrik Hrosovsky pulled a goal back and Barcelona, Madrid's next opponents, would certainly have identified weaknesses ahead of El Clasico, which could have a huge bearing on Lopetegui's future.

Benzema provided a rare clinical moment in a first half packed with wasted chances, storming onto Lucas Vazquez's cross to open the scoring after 11 minutes.

Sergio Ramos had already nodded against the post and both Benzema and Isco failed to add to Madrid's advantage, the latter twice passing up opportunities inside the area.

There were clear openings at the other end too, though, with Plzen preying on Vazquez's poor positioning at right-back and going close on three occasions through Milan Petrzela, David Limbersky and Hrosovsky, who failed to hit the target with the goal gaping.

Jeers from the home crowd greeted missed chances at either end, the Madrid fans frustrated by their own side's profligacy and the ease with which their opponents marched forwards, while the early substitution of Isco was unpopular too.

Gareth Bale's flick teed up Marcelo for a dinked second goal to prompt some belated cheer in the stands, but Hrosovsky's long run and finish ensured a tense conclusion for both the supporters and Lopetegui, who would have been relieved to see his men claim three points.