Borussia Dortmund chief Sebastian Kehl has explained his touchline clash with Atletico Madrid coach Diego Simeone.

The pair squared up furiously during Atletico's 2-1 Champions League win.

Simeone twice shoved Kehl before others intervened.

“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."