Hernan Barcos punched the ball into the net to apparently level up the scores in the game, but after a delay the goal was disallowed, but Palmeiras appealed because they believed video evidence had been used to make the decision.
The Copa do Brasil winners lost the appeal on Thursday however, meaning they are seven points adrift with just four games left.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.