Diego Costa left fuming after officials fail to spot this last minute hand ball (Video)

Chelsea lost 2-1 away at Porto, a result made worse by the officials failing to spot what appeared to be a blatant penalty in the closing minutes.

As Diego Costa, a player renowned for his strong sense of fair play, tried to beat a defender, the ball struck the Porto man's arm. Although right in front of the official standing behind the goal, the penalty appeals were ignored and play continued - depriving the English champions of a golden chance to earn a valuable point. https://twitter.com/MReegen/status/648959391937503232