Simeone twice shoved Kehl before others intervened.
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Emotions rose," said Kehl.
"I had to restrain myself. It was because of something that happened on the field. He knows it. I know. We'll leave it at that."
Borussia Dortmund chief Kehl explains Simeone bust-up
The pair squared up furiously during Atletico's 2-1 Champions League win.