It was another frustrating night for Inter as they could only draw with Atalanta in the Lombardy derby and Walter Mazzarri was left to rue the absence of injured striker Diego Milito.
Inter may well lose further ground on leaders Roma after letting a 1-0 lead slip at Atalanta's Stadio Atleti Azzurri d'Italia, leaving a title challenge looking ever more unlikely.
Ricky Alvarez fired Inter ahead from six yards after 16 minutes but the Orobici struck right back through German Denis' header.
Inter were unable to find a second goal although Mauro Icardi thumped the post in the latter stages after coming on as a substitute.
The pressure is now increasing on coach Mazzarri who is struggling to deliver under the watchful eye of new owner Erick Thohir.
"We played well at a difficult ground against a focused and physical side. It's never easy to get a result here," Mazzarri insisted on Sky Sport after the game.
"If you look at the game, we did more and Denis' goal was a lapse. We are lacking a little cunning and clarity at the moment. We are also short-staffed in attack and really missing Milito. With him in the side we would probably have won."
Argentine marksman Milito is struggling with a thigh injury, which he sustained in training and may not be back in action for a few weeks.
Mazzarri received another injury blow when he saw goalkeeper Samir Handanovic come off at half-time with a hip injury.
"The doctor told me he took a hard knock," the Inter tactician explained. "We have training at 11am tomorrow (Wednesday) and we will see how he is."
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