Atletico Madrid coach Diego Simeone warned the fourth official about Barcelona rival Xavi during Sunday's clash.
Barca won on the day, with the two coaches exchanging plenty of verbals during the match.
Movistar's cameras caught Simeone alerting the fourth official to keep an eye on Xavi.
You have to warn him or he won't keep quiet," Simeone said about Xavi to the referee with a half smile on his face.
This man is not silent at all!" Simeone added while they both laughed.
Cholo make the claim while Xavi looked at him out of the corner of his eye.