West Ham United midfielder Edson Alvarez reportedly threatened to kill Chelsea's Enzo Fernandez during Saturday's London derby.
Chelsea won the game 3-0 with all of the goals coming before the 48th minute.
Seemingly angry with the way the game was going, Alvarez fouled Cole Palmer shortly after the Englishman had scored Chelsea's third goal.
The Mexican was shown a yellow card by referee Samuel Barrott but the drama did not end there.
Moments later, Alvarez was seen shouting something at Argentina international Fernandez while secretively covering his mouth.