Former England defender Rio Ferdinand has branded Chelsea striker Diego Costa a "petulant baby".
The Brazilian was involved in the incident that saw Gabriel Paulista sent off during Chelsea's 2-0 victory over the Gunners.
"Costa acts like a petulant baby," Ferdinand told BT Sport.
"If anything happens it's like the end of the world.
"He's a liability, a ticking time bomb. He's a fantastic player but he has to get back to playing football."
Costa has scored two goals for Chelsea so far this season.
