You might think a major diplomatic incident went down off the pitch at the Emirates last night, the way German newspaper Bild is reporting it.
'Why did Klopp slap Lehmann?' reads their headline, featuring prominently on the homepage of the country's biggest paper's website, alongside a photo of the Dortmund boss with his hand striking the ex-goalkeeper's face.
Jens Lehmann was at the Emirates to support his former teammates Arsenal against a former club of his own, Borussia Dortmund - who he left in 2003 to join the Gunners.
Dortmund manager Jurgen Klopp was up in the stands after his 'bad behaviour' towards a fourth official got him banned from the touchline.
There was however no malice in the 'slap' from Klopp, despite the ambiguous possibility of the photo taken before the game suggesting anything could be possible.
Bild featured the incident in their 'five questions from the game' - with 'Why did Klopp slap Lehmann' at number three.
The former Arsenal man explains, and showed his ever-present sense of humour.
"He greeted me. I did not know now he is banned for a second time! He slapped me, but nicely."
Klopp and Lehmann, now very much a television personality in his homeland, are very good friends, with Lehmann once joking that the Dortmund manager should join him in the studio.
The German newspaper certainly created a drama out of nothing, but it's also great to see Jens Lehmann back at the Emirates supporting his former team.
After the game it was probably Lehmann who felt like returning the favour.
image: © Asia Kuczek