Chelsea defenders Ben Chilwell and Thiago Silva were having a heated discussion during their first half disaster against Arsenal on Tuesday night.
The Blues went into the interval 3-0 down away from home, losing any chance of getting back into the game.
Martin Odegaard (2) and Gabriel Jesus had given the Gunners an unassailable lead, which they eventually converted to a 3-1 win.
TV cameras showed Chilwell and Silva remonstrating with each other and gesticulating on various occasions.
The arguments appeared to focus on the positioning of various players in and around their box.
The Blues have not won a single Premier League game since Frank Lampard took over as caretaker.