The Bulgarian striker put the Cottagers a goal ahead in the eighth minute before revealing an undershirt which read, 'Keep Calm and Pass The Ball To Me', prompting referee Phil Dowd to brandish a yellow card.
It could have been a costly mistake by Berbatov as he was lucky to escape a second booking later on and he will now have to deal with Jol who felt it was a stupid act by the former Manchester United man.
"That was stupid. I need to have a word with him. He probably thought 'I will never get booked' because he never gets booked," said the Dutchman.
"But later he had a situation where he could have gone so I will have a word with him because it is not the brightest thing to do."