Arno Michels had the rare duty of being Chelsea's leading voice from the dugout as he stood on the touchline at Stamford Bridge on Saturday lunchtime.
Even if Thomas Tuchel was stuck at home isolating after testing positive for COVID, the wonders of modern technology made communication to the bench pretty easy, and Michels likely relayed those messages to the players in front of him.
But like we have discovered from distant Zoom calls over the past two years, nothing can replicate the impact and sincerity of face-to-face interaction.