Ronaldinho and his Queretaro team-mates suffered a 2-1 defeat to Mexican league rivals Chiapas at the weekend.
Queretaro were reduced to ten men after a moment of madness from Brazilian midfielder Willian, which saw him punch an opponent in the face.
Willian was shown a straight red card for kicking out before tempers really began to flare.
Chiapas players surrounded Willian, who then lashed out with his fist at one of them.
Former Barcelona star Ronaldinho was quick on hand to try and defuse the situation before Willian left the pitch.
A lenthy ban for the midfielder looks set to follow.
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