United made a shock start to the Champions League home fixture and quickly found themselves 2-0 behind at Old Trafford, much to Ronaldo's fury.
The Portuguese talisman took the responsibility upon his old shoulders and The Sun says set about grilling his team-mates at half-time and demanding to know whether or not they were ashamed by the opening 45 minutes.
"Cristiano addressed the whole team and told them that the performance was unacceptable," a United source revealed.
"He asked if they were not ashamed and said this was not how Manchester United perform in front of their own fans.
"He told them they needed to win the game and, if they didn't, they might not qualify for the next stage of the Champions League."
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