Chelsea manager Jose Mourinho was incensed by the decision not to award a penalty to his side at Southampton.
As they pushed for a second half winner, Cesc Fabregas was booked for diving after going down in the penalty area.
He is the latest Blues player to be shown a yellow card for alleged diving in recent weeks.
The decision left manager Jose Mourinho furious, and he told Sky Sports News his players are being victimised.
"I can't believe that the referee didn't give a penalty. That I can't believe. I can't understand such a big penalty - or I understand as a consequence of something that looks like a campaign," said the Chelsea manager.