Mario Balotelli is facing a fine after being caught swapping his shirt with Real Madrid defender Pepe at half time.
The Liverpool striker was substituted for Adam Lallana at the interval with the Reds trailing 3-0, and did not return to watch the second half.
And Brendan Rodgers was less than impressed when informed of the shirt swapping incident at the final whistle.
“It’s not something I stand for,” said Rodgers, who was unhappy when his defender Mamadou Sakho swapped shirts with Samuel Eto’o at halftime against Chelsea last season.
“I heard about it when I came off the pitch. I don’t like that.
“It’s something that doesn’t happen here, it shouldn’t happen here.
“For me, if you want to do that it’s something you do at the end of the game. I will deal with that tomorrow (Thursday).”
Explaining why Balotelli was replaced with Lallana at half time, Rodgers said: “I felt we needed a bit more movement centrally to occupy their centre halves a bit more . Adam Lallana came on and was tireless in his work rate. That is the minimum here at Liverpool.”