Massimiliano Allegri was left fuming after Juventus surrendered a two-goal lead to draw 3-3 with Parma on Saturday.
Gervinho struck deep into stoppage time to complete the turnaround, his double and Antonino Barilla's goal cancelling out Cristiano Ronaldo's double and one from Daniele Rugani.
The result saw Juve's lead at the top of Serie A cut to nine points, capping a disappointing week in which Allegri's men also were beaten 3-0 by Atalanta in the Coppa Italia on Wednesday.
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And the head coach lamented the fact his team failed to get the basics right in order to see the game out, with Mario Mandzukic guilty of taking liberties in a risky area at the death.