Inter came from behind to defeat Fiorentina 2-1 at Giuseppe Meazza and remain unbeaten in Serie A since the start of the season.
The victory, secured in the closing stages, moved Inter to 22 points at the top of the table. They lead second-placed Lazio on goal difference.
Fiorentina remain 19th with four points after suffering another defeat.
Inter took the lead in the 65th minute when Alex Jimenez struck from outside the penalty area with a powerful effort.
Fiorentina continued to hold on until the 91st minute, when Marcus Thuram levelled for the home side with a low shot from inside the box.
The comeback was completed in the eighth minute of added time. Thuram won a penalty, and Piotr Zielinski converted in the 98th minute to give Inter all three points.
The result continues Inter’s unbeaten start to the current Serie A campaign and represents another late turnaround for the league leaders.
Inter’s next match is against Venezia on Wednesday, 28 October. Fiorentina will face Atalanta.
