The Chelsea players were witnesses of a surreal incident. It also led to arguments in the stand.
Chelsea held an open training session at Stamford Bridge. At one point, the club gave a microphone to the fans present.
The idea was for them to give their score prediction for the game this weekend away to Arsenal. However, one supporter had other ideas.
"Let's have it right, get Werner out of the club," he said. These comments were also heard by the players. This led to some supporters confronting the spectator and others had to intervene to calm the situation down.