Thomas Frank was embarrassingly photographed carrying a coffee cup with Arsenal's badge on it just moments before Tottenham's Premier League clash with Bournemouth on Wednesday.
The Danish boss risked the fury of his own supporters as he emerged from the tunnel at the Vitality Stadium with an espresso cup showing the crest of Tottenham's bitter rivals shortly before kick-off.
In the picture which has now gone viral on social media, Frank can be seen grinning from ear to ear while making no attempt to hide the controversial item.