Luciano Spalletti will suffer sleepless nights after his 10-man Inter side threw away a Derby d'Italia lead and suffered a 3-2 home defeat to rivals Juventus.
Inter came from behind at San Siro despite Matias Vecino's 18th-minute red card following Douglas Costa's opener, Mauro Icardi and an Andrea Barzagli own goal giving them the advantage.
Although Juve were poor in the second period, a Milan Skriniar own goal drew the defending champions level with three minutes to go before Gonzalo Higuain nodded in a Paulo Dybala cross to earn a dramatic victory.
Inter therefore missed the chance to move into the Champions League qualification places but Spalletti said his team's defeat was not a fair reflection of the match.