After the 5-0 win, Klopp initially thought Ronaldo's challenge on Curtis Jones at the end of the first half warranted a red card but had been persuaded otherwise by people who had seen television replays.
The United forward sent the midfielder tumbling to the floor with a wild swing of his right leg and then, with his frustration boiling over, he took a couple of swings at the ball which was positioned against his grounded opponent's midriff.
"I saw it, of course, and it looked like a red card but I got told he hits the ball or didn't hear the whistle," Klopp said.
"I don't want Cristiano getting a red card. For me it looked like (a red) but I got told it was not and that's fine."
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