Jamie Carragher defended the officials at Cardiff by using virtual reality on Monday Night Football to suggest that Willian blocked the view of the referee's assistant for Cesar Azpilicueta's equalizer for Chelsea.
On Super Sunday, Cardiff had looked set for a precious three points in their fight against relegation until Chelsea scored twice in the final six minutes through Azpilicueta and Ruben Loftus-Cheek.
But Azpilicueta's equalizer was shrouded in controversy as the defender appeared to be two yards offside when heading in after Marcos Alonso had flicked on Willian's corner.
It was a decision that left Cardiff manager Neil Warnock fuming after the game and he lamented the poor officiating, saying that while the Premier League was the best league in the world, it had the worst officials.
"I have huge sympathy [with the officials] and I'd go as far as to say that I think it's almost impossible for them to give offside," he said.
