Lautaro Martinez bemoaned Inter's Serie A form this season after they slipped to a shock 1-0 defeat against Bologna, with the forward insistent they have to change.

A Riccardo Orsolini half-volley saw the visitors downed on the road at Stadio Renato Dall'Ara, to leave them 18 points adrift of Napoli in the top-flight.

Having lost the Scudetto to rivals Milan last term, the San Siro outfit had hoped to mount a serious challenge to reclaim their crown this season.

But with any challenge all but long gone amid their indifferent form, Martinez acknowledged something has to shift for Simone Inzaghi's side.

"It would be wrong to talk too much in the heat of the moment," he told Sky Sport Italia. "But the sensation I have right now is that we'll get nowhere playing like this.

"We need to be more consistent. We just played a great game in the Champions League. We arrive here fired up and then [we] put in this performance.

"We've got to get our heads up and push forward, because we will get nowhere like this."

"Bologna are a good side. They played better than us today and deserved the win. We need to be more consistent, like we were against Porto.

"I am here to apologise to all the Inter fans. If I feel the need to say something, then I say it. We are 18 points behind Napoli, so clearly something is not working."

Inter next face a trip to Lecce, followed by a home clash against Spezia ahead of their second leg with Porto in the Champions League.